IS 7231

: 1994

plastic flushing cisterns for water closets and urinals

CurrentFrequently UsedSpecificationBIMMEP · Sanitary Appliances and Water Fittings
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This standard specifies the requirements for materials, construction, dimensions, and performance of plastic flushing cisterns, including single and dual-flush models, for use with water closets and urinals. It outlines tests for flushing effectiveness, leakage, and mechanical endurance to ensure product quality and water conservation.

plastic flushing cisterns for water closets and urinals

Quick Reference Values
Nominal capacity (single flush)10 litres
Nominal capacity (dual flush - full/half)6/3 litres
Minimum wall thickness of cistern body2.5 mm
Endurance test for operating mechanism50000 cycles
Maximum permissible leakage after 1 hour50 ml
Minimum flow rate for float operated valve0.15 l/s at 0.05 MPa
Practical Notes
Always check for the ISI mark on the product, which certifies compliance with material, performance, and safety standards.
Ensure the float valve (ballcock) assembly also complies with IS 1703 for reliable water filling and shut-off.
For dual-flush cisterns, verify both full-flush and half-flush volumes are correctly set up on-site to achieve intended water savings.