Davant 40mm x 21.5mm Solvent Waste To Overflow Reducer

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. Designed 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. This 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. Whether you're a professional plumber or tackling your own home project, this reducer makes the job of adapting pipe sizes easier and more efficient.

Frequently Asked Questions

What is the main purpose of this reducer?

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.

Do I need solvent cement for this fitting?

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.

Can this be used outdoors?

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.

Check out our full range of plumbing supplies.

Browse more overflow available online.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.