The 99-537 Tank to bowl kit fits several Gerber models. It is for the 2 inch flush valve. It is extra thick and works where universal seals are too short. Also this replaces gasket 99-582. Other Part Numbers G0099537, 0099537, 99537, 99-537, 99 537, 99-582, 99582, G0099582, 0099582. UPC:671052594559 or UPC: 671052574070