Part 3 ball valve: what is it & how does it work?
A Part 3 ball valve or diaphragm ball valve is a ball valve made to British Standard specification 1212, Part 3. It consists of a plunger and a diaphragm washer inside a plastic housing. The plunger is partly visible and protrudes from the face of the valve. Water enters the cistern via small plastic spout on …
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