Genuine Gerber 99-853 flush valve. This flush valve comes with the flush valve gasket, nut, and flapper with chain. This flush valve also replaces part 99-005, and 99-003 which had a blue flapper. Other part numbers are G0099853, 0099853, 99853 G0099005, 0099005,99005, G0099003, 0099003, 99003, 99-003. This flush valve is a 3 inch valve.