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The SLOAN 3307135 is a purple-coded piston assembly designed for 1.28 GPF (gallons per flush) closet flushometer valves in the Sloan GEM2 product family. The piston assembly is the core flow-control component inside a flushometer — it regulates water volume per cycle and determines flush rate. Color coding allows technicians to identify the flow rating at a glance without disassembly. This assembly is installed by licensed plumbers and commercial facility maintenance professionals servicing water closet flush valves in restroom fixture systems.
This piston assembly is suited for commercial and institutional restroom applications where water-efficient 1.28 GPF closet flushing is required. It is a direct internal replacement component for Sloan GEM2 flushometer valves installed on floor-mounted or wall-hung water closets. The 1.28 GPF rating aligns with low-consumption fixture requirements common in code-compliant commercial construction and renovation projects.
Designed for use with Sloan GEM2 series flushometer valves configured for water closet service at 1.28 GPF.
Installation should be performed by a licensed plumber familiar with commercial flushometer service. Shut off the water supply and relieve line pressure before opening the flushometer body. Follow all applicable local plumbing codes and IPC requirements when servicing flush valves in commercial restroom systems. Do not mix piston assemblies of different color codes within the same valve, as this will alter the calibrated flush volume.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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