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can anyone tell me the difference between a high pressure ball valve like this and one like this They are described as part 2 and part 1 . In particular what is the function of the white switch on the part 2 type. Is it a kind of stopcock? many thanks

Hello I am new to this website and i hope i am not asking a stupid question.... However, I live in a converted flat on the first floor and am trying to locate a tap to switch off the water to the cold water tank in the loft. The tank is overflowing and i need to change the washer. I have looked...