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  • BSI
    BS 1125:1987 Specification for WC flushing cisterns (including dual flush cisterns and flush pipes)
    Edition: 1987
    $313.97
    / user per year

Description of BS 1125:1987 1987

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.

Standard NumberBS 1125:1987
TitleSpecification for WC flushing cisterns (including dual flush cisterns and flush pipes)
StatusConfirmed
Publication Date1987-03-31
ReplacesBS 1125:1973
DescriptorsSiphonic WC pans, Flow measurement, Volume, Pipes, Test pressure, Flow rates, Sanitary appliances, Ceramics, Flushing cisterns, Impact testing, Pipe connections, Marking, Mechanical testing, Thickness, Width, Test equipment, Dual-flush cisterns, Instructions for use, Position, Design, Deformation, Plastics, Opacity
ICS91.140.70 Sanitary installations
CommitteeB/503
ISBN0 580 15742 3
PublisherBSI
Pages18

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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