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Specification for WC flushing cisterns (including dual flush cisterns and flush pipes)
BS 1125 specifies requirements for WC flushing cisterns with valveless siphons, nominally 9 L (litres), for high level, low level and close coupled positions, together with the necessary flush pipes.
The cisterns specified are of the type which flushes 9 L only, (i.e. the single flush type), or of the type which flushes, as selected, either 4.5 L or 9 L, (i.e. the dual flush type).
Float operated valves and methods of fixing are not covered by BS 1125.
- NOTE 1: Dual flush type cisterns are intended for use with washdown pans in domestic premises only.
- NOTE 2: The titles of the publications referred to in this standard are listed on the inside back cover.
Cisterns with valveless siphons, nominally 9 litres, for high level, low level and close coupled positions, in both ceramic and plastics.
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