For Flushmate C-100500-K Cartridge Toilet Piston Parts 500, 501, 501A, 501B, 503 Replacement For C-100500-K Flushmate Cartridge Toilet Piston Cartridge Parts for Compatible with 500, 501, 501A, 501B, 503, and 504 Series Flushmate Tank System Directly replacement Part for Flushmate C-100500-K. Perfectly suitable for series 500, 501, 501A, 501B, 503 and 504 Pressure Assist tank systems. Compatible with Flushmate M-101526-F3,M-101526-F4 Pressure Assist tank, Flushmate I - 501/501A Flushmate II - 501B, Flushmate III - 503, Flushmate IV - 504 ?Reliable Performance? Replace your old or broken flushmate flush cartridge. Solve problems such as slow flushing of your toilet, water draining from around the rim of the toilet, water in the filter area, etc. Flushmate has made the cartridge replacement process simple. The cartridge on all Flushmate systems can be removed by turning the cartridge counter clockwise. Installation is simply screwing the cartridge into the Flushmate system clockwise. The replacement process normally only takes 15 minutes. Included 1x C-100500 Flushmate 1.6 GPF Cartridge Assembly, 1x Flushmate Upper Supply DuckBill Replacement, 1x Flushmate Lower Supply Filter Screen, 1x Installation Instructions