Part 2 Ballcock / Float Valves BS1212/2
BS1212 part 2 is the British Standard number for brass diaphragm type float operated valves.
Part 2 float valves (also known as ballcocks, inlet valves, fill valves or ball valves) are quieter than the part 1 version and better suited in applications that need to prevent back flow. They are are used in WC toilet cisterns, loft / attic cold water tanks and central heating feed / expansion header tanks.
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