This Singapore Standard specifies requirements for valveless siphonic WC flushing cisterns, nominally 9 litres, for both high level and low level positions, together with the necessary flush pipes.
Cisterns may be of the type which flushes 9 litres only (i.e. the single flush type), or of the type which flushes, as selected, either 4.5 litres or 9 litres (i.e. the dual flush type).
NOTE: Under the local bye-laws, only cisterns of the dual flush type shall be used. Single flush cisterns manufactured to this specification shall be for export only.
SS 68-1984 history
1984SS 68-1984 SPECIFICATION FOR WC Flushing Cisterns, Including Dual Flush Cisterns And Flush Pipes