Non return vales how to use and where to place @ cost £2 to £25. inline non return vales from tank to taps via pump, cold and hot water. 12mm pipe
So non return vales x how many 2, 3 ,4 or5. 2vales 1 on each tank ?
4 vales after pumps in each line ? 4 vales 4 after pumps .ie 2 hot 2 cold
Five...