The Flushmate M-101526-F31, 503 Series

• For ALL OEMs except Kohler K 4404 tank and Gerber 28-385 tank ; CAUTION does NOT work in One-piece Fixtures ; Tank-to-Bowl Gasket
• It does NOT fit 10 Inch rough-in tanks, only 12 Inch rough-in tanks. “Rough-in” refers to the distance from the wall to the bolts at the center of the drain.
• ONLY used on model 503 Flushmate Systems 1.6 gpf tanks