{"title":"Overflow | Plumbing Supplies","description":"\u003cp data-start=\"270\" data-end=\"643\"\u003eKeep your plumbing system safe, compliant and free from water damage with our range of \u003cstrong data-start=\"357\" data-end=\"369\"\u003eoverflow\u003c\/strong\u003e products at \u003cstrong data-start=\"382\" data-end=\"407\"\u003eJJ Building Materials\u003c\/strong\u003e. Designed to prevent unwanted spills from tanks, cisterns and appliances, each \u003cstrong data-start=\"487\" data-end=\"504\"\u003eoverflow pipe\u003c\/strong\u003e and fitting in our collection provides reliable protection and efficient water discharge for both domestic and commercial installations.\u003c\/p\u003e\n\u003ch3 data-start=\"645\" data-end=\"689\"\u003eOverflow Pipe for Safe Water Discharge\u003c\/h3\u003e\n\u003cp data-start=\"691\" data-end=\"1135\"\u003eOur \u003ca href=\"\/products\/davant-21-5mm-solvent-overflow-straight-coupler\" title=\"overflow pipe\"\u003e\u003cstrong data-start=\"695\" data-end=\"712\"\u003eoverflow pipe\u003c\/strong\u003e\u003c\/a\u003e options are manufactured from durable, lightweight materials to ensure long-lasting performance. Easy to cut, install and connect, each \u003cstrong data-start=\"849\" data-end=\"866\"\u003eoverflow pipe\u003c\/strong\u003e is designed to divert excess water safely away from tanks, toilets, cylinders and cold-water storage systems — helping prevent leaks, damp and overflows. Available in both standard and high-flow sizes, these pipes offer dependable performance in all plumbing setups.\u003c\/p\u003e\n\u003ch3 data-start=\"1137\" data-end=\"1183\"\u003eDurable and Versatile Overflow Solutions\u003c\/h3\u003e\n\u003cp data-start=\"1185\" data-end=\"1517\"\u003eFrom simple pipe lengths to connectors and elbows, our \u003cstrong data-start=\"1240\" data-end=\"1252\"\u003eoverflow\u003c\/strong\u003e components are built to withstand everyday use while providing consistent water flow. Suitable for use with plastic or copper systems, each fitting ensures a secure, watertight connection that’s ideal for loft tanks, toilet cisterns, condensing boilers and more.\u003c\/p\u003e\n\u003ch3 data-start=\"1519\" data-end=\"1578\"\u003eEasy Installation for Domestic and Commercial Systems\u003c\/h3\u003e\n\u003cp data-start=\"1580\" data-end=\"1904\"\u003eEach \u003cstrong data-start=\"1585\" data-end=\"1602\"\u003eoverflow pipe\u003c\/strong\u003e is designed for quick installation with standard plumbing tools. Their lightweight, corrosion-resistant construction makes them ideal for both new builds and repair work. Whether you're a professional tradesperson or a DIY installer, our overflow range offers straightforward and reliable solutions.\u003c\/p\u003e\n\u003ch3 data-start=\"1906\" data-end=\"1967\"\u003eWhy Choose Overflow Products from JJ Building Materials\u003c\/h3\u003e\n\u003cp data-start=\"1969\" data-end=\"2226\"\u003eHigh-quality \u003cstrong data-start=\"1982\" data-end=\"1999\"\u003eoverflow pipe\u003c\/strong\u003e for tanks, toilets and appliances\u003cbr data-start=\"2033\" data-end=\"2036\"\u003eCompatible with standard plumbing systems\u003cbr data-start=\"2077\" data-end=\"2080\"\u003eLightweight, durable and corrosion-resistant\u003cbr data-start=\"2124\" data-end=\"2127\"\u003eEasy to install with secure, watertight fittings\u003cbr data-start=\"2175\" data-end=\"2178\"\u003eCompetitive pricing with fast UK-wide delivery\u003c\/p\u003e\n\u003ch3 data-start=\"2228\" data-end=\"2238\"\u003eFAQs\u003c\/h3\u003e\n\u003ch4 data-start=\"2240\" data-end=\"2281\"\u003eWhat is an overflow pipe used for?\u003c\/h4\u003e\n\u003cp data-start=\"2282\" data-end=\"2409\"\u003eAn \u003cstrong data-start=\"2285\" data-end=\"2302\"\u003eoverflow pipe\u003c\/strong\u003e carries excess water safely away from tanks or cisterns to prevent leaks, flooding or structural damage.\u003c\/p\u003e\n\u003ch4 data-start=\"2411\" data-end=\"2452\"\u003eWhat size overflow pipe do I need?\u003c\/h4\u003e\n\u003cp data-start=\"2453\" data-end=\"2583\"\u003eMost domestic installations use standard-size overflow pipe, but high-flow options may be needed for larger tanks or appliances.\u003c\/p\u003e\n\u003ch4 data-start=\"2585\" data-end=\"2630\"\u003eCan I replace an overflow pipe myself?\u003c\/h4\u003e\n\u003cp data-start=\"2631\" data-end=\"2803\"\u003eYes — replacing an \u003cstrong data-start=\"2650\" data-end=\"2667\"\u003eoverflow pipe\u003c\/strong\u003e is typically straightforward for confident DIY users, but always ensure it is securely fitted and directed to a safe discharge point.\u003c\/p\u003e\n\u003cp data-start=\"2631\" data-end=\"2803\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"2631\" data-end=\"2803\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 107%; font-family: 'Arial',sans-serif; mso-fareast-font-family: Aptos; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;\"\u003eCheck out our other \u003cb\u003e\u003ca href=\"\/collections\/plumbing-supplies\" title=\"Plumbing Supplies\"\u003ePlumbing Supplies\u003c\/a\u003e \u003c\/b\u003eand\u003cb\u003e \u003ca href=\"\/collections\/waste-pipeworks\" title=\"Waste \u0026amp; Pipeworks\"\u003eWaste \u0026amp; Pipeworks\u003c\/a\u003e \u003c\/b\u003erange at JJ Building Materials.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"davant-21-5mm-solvent-overflow-straight-tank-connector","title":"Davant 21.5mm Solvent Overflow Straight Tank Connector","description":"The Davant 21.5mm Solvent Overflow Straight Tank Connector is a simple yet essential component designed to provide a secure and watertight connection between a pipe and a water storage tank. Whether you're working on a domestic cold water system, an overflow pipe for a loft tank, or a small garden water butt, this fitting makes installation straightforward and reliable.\n\nDesigned for use with 21.5mm solvent weld overflow pipe, this straight connector is available in both black and white finishes to match the surrounding pipework and installation environment. It provides a clean and professional look while delivering dependable performance over time.\n\nThis connector is solvent weld compatible, meaning it is intended to be permanently bonded to plastic pipe using solvent cement. Once applied, the joint becomes strong and leak-resistant, ideal for long-term applications where durability is key. The straight-through design ensures an uninterrupted flow path, helping to manage overflow efficiently and avoid unwanted water buildup.\n\nSuitable for both residential and light commercial systems, this tank connector is commonly used in vented cold water storage tanks, cisterns, or any overflow installation requiring a reliable through-tank connection.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat is this tank connector typically used for?\u003c\/h4\u003e It’s used to connect an overflow pipe to a water storage tank or cistern, allowing excess water to safely exit the tank without causing flooding or overfilling. \u003cbr\u003e \u003ch4\u003eIs this connector suitable for both indoor and outdoor tanks?\u003c\/h4\u003e Yes, it can be used in both indoor and sheltered outdoor applications. For outdoor use, ensure the installation is protected from harsh UV exposure or use the black version for improved UV resistance. \u003cbr\u003e \u003ch4\u003eHow is the pipe connected to the fitting?\u003c\/h4\u003e This is a solvent weld fitting, so the pipe is permanently bonded using solvent cement. Apply the cement to both the inside of the connector and the outside of the pipe, then push them together for a strong, watertight seal.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802394464598,"sku":"148201","price":1.08,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802394497366,"sku":"148202","price":1.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-215mm-solvent-overflow-straight-tank-connector-2500919.jpg?v=1772662420"},{"product_id":"davant-21-5mm-solvent-overflow-bent-tank-connector","title":"Davant 21.5mm Solvent Overflow Bent Tank Connector","description":"The Davant 21.5mm Solvent Overflow Bent Tank Connector is a simple yet essential fitting designed to connect an overflow pipe to a water storage tank at an angled position. This clever design allows for a more flexible and space-saving installation—ideal when straight connections aren’t practical due to tight spaces or awkward pipe runs.\n\nAvailable in black or white to suit a range of tank types and aesthetic preferences, this tank connector works with standard 21.5mm solvent weld overflow pipe. It's typically used in cold water storage tanks, loft tanks, or other applications where an angled connection is required for routing overflow pipes.\n\nThe bent design directs water away at an angle while maintaining a secure, leak-resistant connection. It’s especially useful in confined spaces where a straight-through fitting may not allow for proper pipe clearance or routing. As a solvent weld connector, it forms a permanent, watertight bond when used with appropriate solvent cement, ensuring long-term reliability in both residential and light commercial systems.\n\nThis connector is ideal for overflow setups where precision and durability are key, offering a neat, tidy finish with dependable performance.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat is the benefit of the bent design?\u003c\/h4\u003e The angled design allows the pipe to exit the tank in a direction that suits tight or awkward spaces, making it easier to route overflow pipework neatly and efficiently. \u003cbr\u003e \u003ch4\u003eCan this connector be used with all types of tanks?\u003c\/h4\u003e Yes, it is compatible with most cold water storage tanks and cisterns that support 21.5mm overflow outlets. Just ensure the installation area allows for the angled outlet to be positioned correctly. \u003cbr\u003e \u003ch4\u003eHow do I install this fitting securely?\u003c\/h4\u003e Use solvent weld cement to bond the connector to a 21.5mm overflow pipe. Apply the cement to both surfaces, push the pipe fully into the fitting, and allow it to cure for a strong, watertight connection. Always follow the instructions on the solvent cement for best results.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802394530134,"sku":"148203","price":0.63,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802394562902,"sku":"148204","price":0.63,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-215mm-solvent-overflow-bent-tank-connector-1407337.jpg?v=1772662422"},{"product_id":"davant-21-5mm-solvent-overflow-straight-coupler","title":"Davant 21.5mm Solvent Overflow Straight Coupler","description":"The Davant 21.5mm Solvent Overflow Straight Coupler is a simple but essential fitting for extending or repairing overflow pipe runs. Designed to join two lengths of 21.5mm overflow pipe, this straight coupler is ideal for use in cold water storage systems, cisterns, and other plumbing applications where excess water needs to be safely directed away.\n\nAvailable in both black and white, the coupler blends seamlessly with your existing pipework, offering both functionality and a neat finish. Whether you're extending a pipe run or replacing a damaged section, this coupling ensures a secure, reliable connection between two straight pipe ends.\n\nThe fitting is designed for use with solvent weld systems, meaning it creates a permanent and watertight bond when used with solvent cement. Once the cement is applied and the pipes are joined, the connection becomes durable and long-lasting—perfect for systems that don’t require regular disassembly.\n\nWhether you’re a plumber, installer, or competent DIYer, this straight coupler is an essential part of any overflow system toolkit, helping maintain safety and prevent water damage from overflows.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat type of pipe does this coupler connect?\u003c\/h4\u003e This coupler is designed to connect two lengths of 21.5mm solvent weld overflow pipe, typically used in cold water tanks, cisterns, and waste systems. \u003cbr\u003e \u003ch4\u003eDoes this coupler require any tools or equipment to install?\u003c\/h4\u003e No tools are needed beyond solvent cement. Simply apply the cement to both the inside of the coupler and the outside of the pipe ends, push them together, and allow time for the bond to set. \u003cbr\u003e \u003ch4\u003eCan it be used outdoors?\u003c\/h4\u003e Yes, it can be used in sheltered outdoor installations. The black version is particularly well-suited for outdoor use due to better UV resistance, though it should still be protected from prolonged exposure where possible.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802394628438,"sku":"148205","price":0.46,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802394661206,"sku":"148206","price":0.46,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-215mm-solvent-overflow-straight-coupler-6672422.jpg?v=1772662421"},{"product_id":"davant-21-5mm-black-solvent-overflow-equal-tee","title":"Davant 21.5mm Black Solvent Overflow Equal Tee","description":"The Davant 21.5mm Solvent Overflow Equal Tee is a versatile and practical fitting designed to connect three sections of 21.5mm overflow pipe. Shaped in a classic \"T\" formation, it allows you to split or join overflow pipework efficiently—making it perfect for installations where multiple branches need to be directed from a single flow path.\n\nAvailable in a black finish (with white options often available), this fitting is ideal for both functional and discreet installations in cold water storage systems, cistern overflows, or any system designed to safely divert excess water. Its simple design ensures a neat and reliable connection between pipe sections, helping to maintain consistent flow and prevent leaks.\n\nThis equal tee is designed for use with solvent weld systems, meaning it must be fixed in place using solvent cement. Once applied, the bond becomes strong, permanent, and leak-free—perfect for systems that don’t require regular disassembly and where long-term performance is key.\n\nWhether you’re a professional plumber or working on a DIY project, this equal tee makes it easy to customise and expand your overflow system with confidence.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat is an “equal tee” fitting?\u003c\/h4\u003e An equal tee connects three pipes of the same diameter—in this case, 21.5mm. It allows fluid to flow from one pipe and be split into two, or to merge two flows into one outlet, depending on the installation. \u003cbr\u003e \u003ch4\u003eDo I need solvent cement to install this fitting?\u003c\/h4\u003e Yes, this is a solvent weld fitting. For a secure and leak-proof connection, you’ll need to use solvent cement on both the pipe ends and the inside of the tee before joining them together. \u003cbr\u003e \u003ch4\u003eCan this be used in outdoor overflow systems?\u003c\/h4\u003e Yes, the black version is well-suited for external use, particularly in shaded or protected areas. It offers better UV resistance than white fittings, but for long-term exposure, additional protection is recommended.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802394726742,"sku":"148207","price":0.59,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802394759510,"sku":"148208","price":0.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-215mm-black-solvent-overflow-equal-tee-5064173.jpg?v=1772662423"},{"product_id":"davant-21-5mm-solvent-overflow-45-degree-elbow","title":"Davant 21.5mm Solvent Overflow 45 Degree Elbow","description":"The Davant 21.5mm Solvent Overflow 45° Elbow is a reliable and easy-to-use fitting designed to connect two overflow pipes at a 45-degree angle. Ideal for systems where a straight run isn’t practical, this elbow helps you navigate around corners or obstacles while maintaining a smooth, efficient flow path for excess water.\n\nThis fitting is typically used in overflow and condensate systems, such as those connected to cold water storage tanks, cisterns, or other low-pressure drainage setups. The 45-degree angle provides a gentler change in direction than a 90-degree elbow, which can improve water flow and reduce the risk of blockages over time.\n\nMade for use with standard 21.5mm solvent weld pipe, the elbow is installed using solvent cement, creating a permanent and watertight seal. The black finish offers a clean, professional look—particularly suited for external or visible pipework installations.\n\nWhether you’re a professional plumber or a DIYer handling your own overflow system, this 45° elbow offers a practical, durable solution for building or modifying pipe runs in tight or tricky spaces.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat is the benefit of using a 45° elbow over a 90° elbow?\u003c\/h4\u003e A 45-degree elbow offers a smoother change in direction, which helps maintain better flow and reduces the risk of clogging—especially in overflow systems where gradual movement of water is preferred. \u003cbr\u003e \u003ch4\u003eIs this fitting compatible with white 21.5mm pipe?\u003c\/h4\u003e Yes, while the fitting itself is black, it can be used with both black and white 21.5mm solvent weld pipes. The only difference is cosmetic, so it depends on your visual preference for the installation. \u003cbr\u003e \u003ch4\u003eHow is this elbow installed?\u003c\/h4\u003e This is a solvent weld fitting, so it requires solvent cement. Apply the cement to both the inside of the elbow and the outside of the pipe, then push them together firmly. Once set, the joint will be secure and leak-proof.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802394792278,"sku":"148209","price":0.59,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802394825046,"sku":"148210","price":0.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-215mm-solvent-overflow-45-degree-elbow-6569751.jpg?v=1772662423"},{"product_id":"davant-21-5mm-black-solvent-overflow-90-degree-elbow","title":"Davant 21.5mm Black Solvent Overflow 90 Degree Elbow","description":"The Davant 21.5mm Solvent Overflow 90° Elbow is a practical and essential fitting used to connect two overflow pipes at a right angle. Designed for use with 21.5mm solvent weld pipe systems, this elbow fitting helps you neatly and securely change the direction of pipework in cold water storage, cistern, or condensate systems.\n\nIdeal for installations where space is tight or the pipe needs to turn a corner, the 90° elbow provides a clean, efficient route for managing overflow water. Its solid plastic construction offers long-lasting durability, and the tight angle is perfect for creating compact layouts without compromising on flow performance.\n\nAvailable in both black and white, this elbow fitting allows you to match your existing pipework, whether you’re working indoors or on an external system. It’s particularly well suited to use in loft tanks, boiler overflows, or any setup where water needs to be safely diverted.\n\nInstallation is straightforward—simply apply solvent weld cement to the pipe and the inside of the fitting, then push together for a permanent, watertight seal.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhen should I use a 90° elbow in an overflow system?\u003c\/h4\u003e A 90° elbow is used when you need to make a sharp turn in your overflow pipework, such as going around a corner or connecting vertical and horizontal runs. It’s great for tight spaces and efficient routing. \u003cbr\u003e \u003ch4\u003eIs this compatible with both black and white 21.5mm pipes?\u003c\/h4\u003e Yes, the fitting is designed for 21.5mm solvent weld overflow pipe, regardless of colour. The black and white options are purely aesthetic to match the surrounding pipework. \u003cbr\u003e \u003ch4\u003eDo I need any special tools to install this elbow?\u003c\/h4\u003e No special tools are required. You’ll just need solvent cement, a clean pipe end, and a firm push to connect. Once bonded and set, the joint is strong and leak-proof.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802394857814,"sku":"148211","price":0.46,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802394890582,"sku":"148212","price":0.46,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-215mm-black-solvent-overflow-90-degree-elbow-5283945.jpg?v=1772662420"},{"product_id":"davant-32mm-x-21-5mm-solvent-waste-to-overflow-reducer","title":"Davant 32mm x 21.5mm Solvent Waste To Overflow Reducer","description":"The Davant 32mm x 21.5mm Solvent Waste to Overflow Reducer is a compact and versatile fitting designed to connect 21.5mm overflow pipe to a 32mm solvent weld waste system. Whether you're adapting a condensate or overflow outlet into a larger waste line, this reducer makes the transition smooth, secure, and reliable.\n\nAvailable in black or white to match your existing pipework, this fitting ensures a neat and discreet finish in both visible and concealed plumbing installations. It’s ideal for use in bathrooms, kitchens, utility areas, or boiler setups where overflow water needs to be directed into an existing waste pipe.\n\nThe reducer is made for use with solvent weld systems, meaning it forms a permanent, watertight seal when used with solvent cement. This not only ensures a secure connection but also prevents leaks and maintains long-term performance with minimal maintenance.\n\nWhether you’re a professional installer or a competent DIYer working on your home plumbing system, the Davant solvent waste to overflow reducer is a simple yet essential part of a well-designed drainage setup.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat is this reducer used for?\u003c\/h4\u003e It allows a smaller 21.5mm overflow pipe to connect into a larger 32mm waste pipe. This is especially useful when routing overflow or condensate drainage into a domestic waste system. \u003cbr\u003e \u003ch4\u003eIs solvent cement necessary for installation?\u003c\/h4\u003e Yes, this reducer is designed for solvent weld systems. You'll need to apply solvent cement to both the fitting and pipe to create a strong, watertight bond. Always allow proper curing time for a secure connection. \u003cbr\u003e \u003ch4\u003eCan I use this fitting indoors and outdoors?\u003c\/h4\u003e Yes, it can be used in both indoor and sheltered outdoor applications. Just make sure to choose the correct colour—black is more UV-resistant for outdoor use, while white blends better with indoor fittings.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black \/ 32mm","offer_id":50802394956118,"sku":"148213","price":1.08,"currency_code":"GBP","in_stock":true},{"title":"White \/ 32mm","offer_id":50802394988886,"sku":"148214","price":1.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-32mm-x-215mm-solvent-waste-to-overflow-reducer-1822465.jpg?v=1772662418"},{"product_id":"davant-40mm-x-21-5mm-solvent-waste-to-overflow-reducer","title":"Davant 40mm x 21.5mm Solvent Waste To Overflow Reducer","description":"The Davant 40mm x 21.5mm Solvent Waste to Overflow Reducer is a handy, space-saving fitting that allows you to connect a smaller 21.5mm overflow pipe into a 40mm solvent weld waste system. It’s a smart solution when you need to direct overflow or condensate water—such as from a cold water tank, boiler, or appliance—into a larger household drainage pipe.\n\nDesigned to fit securely and neatly, this reducer is ideal for use in bathrooms, kitchens, utility rooms, or plant rooms. Available in both black and white, it can be matched to your existing pipework for a tidy, professional look in either indoor or sheltered outdoor installations.\n\nThis reducer is part of a solvent weld system, which means it’s designed to form a permanent and watertight bond when used with solvent cement. Once joined and cured, the connection will resist leaks and provide long-lasting reliability, even under regular use.\n\nWhether you're a professional plumber or tackling your own home project, this reducer makes the job of adapting pipe sizes easier and more efficient.\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003ch4\u003eWhat is the main purpose of this reducer?\u003c\/h4\u003e It’s used to connect a 21.5mm overflow pipe into a larger 40mm solvent weld waste fitting—perfect for combining smaller drain lines, like condensate or overflow pipes, into a main waste outlet. \u003cbr\u003e \u003ch4\u003eDo I need solvent cement for this fitting?\u003c\/h4\u003e Yes, solvent cement is required to create a strong, permanent seal. Apply it to both the inside of the fitting and the outside of the pipe before inserting them together and allowing it to set. \u003cbr\u003e \u003ch4\u003eCan this be used outdoors?\u003c\/h4\u003e Yes, it can be used in sheltered outdoor locations. For external use, the black version is recommended as it offers better resistance to UV exposure compared to white.\u003cbr\u003e\u003cp\u003eCheck out our full range of \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/plumbing-supplies\"\u003eplumbing supplies\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eBrowse more \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow\"\u003eoverflow\u003c\/a\u003e available online.\u003c\/p\u003e","brand":"Davant","offers":[{"title":"Black","offer_id":50802395152726,"sku":"148215","price":1.08,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":50802395185494,"sku":"148216","price":1.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/davant-40mm-x-215mm-solvent-waste-to-overflow-reducer-7553313.jpg?v=1772662417"}],"url":"https:\/\/jjbuildingmaterials.co.uk\/collections\/overflow.oembed","provider":"JJ Building Materials","version":"1.0","type":"link"}