V&G Compression Stopcock Poly x Copper

The V&G Compression Stopcock (Poly x Copper) from Evolve is a practical and durable solution for isolating a property's water supply when transitioning between different pipe materials—specifically from MDPE (poly) to copper pipe. Whether you're working on a new build, an outdoor installation, or making updates to existing plumbing, this valve offers an efficient way to gain control over your water flow. Made from high-quality brass and approved by WRAS (Approval Number: 1403907), this stopcock ensures safe and reliable use in both domestic and commercial systems. It features compression fittings on both ends, allowing for a straightforward installation without the need for heat, solder, or specialist tools. Just tighten the compression nuts to create a leak-proof seal—perfect for quick installations or tight spaces. This stopcock is ideal for systems that require a transition from MDPE pipe (typically used for underground or external water supplies) to internal copper pipework. Available in a variety of sizes—20mm x 15mm, 25mm x 15mm, and 25mm x 22mm—it suits a wide range of applications, offering flexibility for both professional plumbers and capable DIYers.

Frequently Asked Questions

What does “Poly x Copper” mean?

It means the stopcock connects MDPE (polyethylene) pipe on one side and standard copper pipe on the other. It’s used to transition between external and internal water supply pipework.

Is this stopcock suitable for drinking water?

Yes, it’s WRAS approved (Approval Number: 1403907), which means it's certified for use with potable water and meets UK safety and hygiene standards.

Do I need any specialist tools for installation?

No, standard plumbing spanners or grips are all you need. The compression fittings are designed for ease of use—just ensure both pipe ends are clean, cut squarely, and inserted fully before tightening the nuts.

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