I'm fitting mixer taps to basin & Bidet.
Each tap is supplied with two separate flexi pipes for assembly.
Manufacturer's leaflet says fit non return valves to hot and cold pipes.
Manufacturer's tech dept says fit only to cold pipe
One internet video; plumber says fit only to hot water pipe.
I intend to also fit an isolation valve to basin, bidet and pan supply pipes for maintenance with a non return valve below them.
I've also searched UK Water regulations, not yet found a simple diagram for non return valve positions, must be available though.
Does anyone know where a single none return valve should really be fitted.
Each tap is supplied with two separate flexi pipes for assembly.
Manufacturer's leaflet says fit non return valves to hot and cold pipes.
Manufacturer's tech dept says fit only to cold pipe
One internet video; plumber says fit only to hot water pipe.
I intend to also fit an isolation valve to basin, bidet and pan supply pipes for maintenance with a non return valve below them.
I've also searched UK Water regulations, not yet found a simple diagram for non return valve positions, must be available though.
Does anyone know where a single none return valve should really be fitted.