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The bath has a 22mm connection and the basin a 15mm. I did notice before fitting the non return valves that when you turned on and off the cold water while the hot was running that the hot stoped flowing for a second after the cold had been turned off if that makes any sense. Thanks.

I live in a ground floor flat. Yes i mean basin. Not sure about the taps. I fitted the non return valves thinking that the higher pressure from the cold was pushing the hot back down the pipe. I have also thought about fitting a pump to the hot water pipe but not sure what kind of pump i would...

Thanks for the reply. If i were to remove the non return valves and connect the cold pipe to the hot and switch on the cold for a few seconds would this remove it? Or will i just get another air lock when i connect back again? What would be the easiest thing to do? Thanks.

I have just fitted a new bathroom suite. The hot water pressure was fine before i started. After fitting mixer taps to my sink and bath i have found that the hot water has been reduced to no more than a trickle. I fitted non return valves to both the hot and cold pipes but still no joy. The cold...