This standard specifies the requirements, materials, dimensions, and testing methods for single and dual flushing cisterns used with water closets and urinals. MEP and plumbing engineers use it to ensure water efficiency, durability, and reliable mechanical performance of sanitary flushing systems.
Specifies requirements for flushing cisterns made of plastic and vitreous china, used with water closets and urinals.
Quick Reference Values
Standard dual flush capacities3/6 Liters or 2/4 Liters
Standard single flush capacities5, 6, or 10 Liters
Endurance test requirement50,000 cycles for flushing mechanism
Float valve operating pressure range0.05 MPa to 1.0 MPa
Practical Notes
Always ensure the flushing cistern's flush volume matches the hydraulic design requirements of the specific WC pan to prevent poor clearing or excessive water waste.
Dual flush cisterns are highly recommended and often mandated by green building codes (like IGBC or GRIHA) for water conservation.
Pay special attention to the float valve specifications (IS 1703 or IS 12234) to prevent continuous leakage in high-pressure water supply zones.