ARMSTRONG Pump Gasket, Nitrile, 10-3/16 in ID x 10-15/16 in OD x 1/16 in THK SPECIFICATIONS Dimensions : 10-3/16 in ID x 10-15/16 in OD x 1/16 in THK Material : Nitrile Size : 10 in FEATURES 10-5/32 in Dia maximum impeller For use with 4030, 4280, 4300, 4380 series pump