BS 6675 – Specification for servicing valves (copper alloy) for water services
Three patterns of servicing valve: spherical plug, tapered plug and screw-down, of nominal sizes 10, 12, 15 and 22, suitable for working pressures and temperatures from 16 bar at up to and including 30°C to 5 bar at a maximum of 120°C. The purpose of the valve is to isolate water supplies to individual sanitary appliances so that those appliances can be maintained or serviced.
