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A check valve (or sometimes known as a non return check valve is a device designed to allow the flow of a substance (in this case water) in one direction whilst preventing it from returning in the other if the supply pressure should drop. Here at On-Demand Supplies we stock a wide range of double check valves in various sizes, such as your more standard 15mm and 22mm, as well as much larger sizes.
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ESDA Ltd (Trading As On-Demand Supplies)
Churcham Business Park
Churcham
Gloucester
Gloucestershire
GL2 8AX
UK