Full Flow Isolation Valve – 15mm – WRAS Approved

A full flow isolation valve is one of those fittings you barely notice until you desperately need one. When a tap starts dripping at 11pm or a washing machine valve decides to give up, being able to isolate the supply at the appliance without turning off the whole house is exactly what separates a five-minute fix from an emergency call-out. This 15mm full flow isolation valve does exactly that job, and it does it reliably.

The valve fits standard 15mm copper or compatible plastic pipework and operates with a simple quarter-turn, using a flat-blade screwdriver. Open is in line with the pipe, closed is across it. Nothing complicated. The full bore design means flow restriction is minimal when the valve is open, which matters for appliances that are sensitive to reduced supply pressure.

Full Flow Isolation Valve: WRAS Approval and Why It Matters

WRAS approval confirms this valve meets the Water Regulations Advisory Scheme requirements for use in UK potable water installations. That is not just a box-ticking exercise. It means the materials used will not contaminate the drinking water supply and the valve has been independently assessed against UK water regulations. If you are working on any installation connected to the mains supply, WRAS-approved fittings are the correct choice, and on some contracts they are a requirement.

These valves are used constantly in domestic plumbing work. Under-sink installations, washing machine and dishwasher supplies, toilet cisterns, bathroom basins, outside tap feeds, and boiler connections all benefit from a dedicated isolation point. At this price, there is no sensible reason to install an appliance without one.

Compact and straightforward to fit, this is a bread-and-butter fitting that belongs in every plumber’s van and every plumbing supplies order. Buy a handful at a time — you will always find a use for them.