ARMSTRONG Body Casing Gasket, Nitrile, 6-1/4 in ID x 7 in OD x 1/16 in THK SPECIFICATIONS Dimensions : 6-1/4 in ID x 7 in OD x 1/16 in THK Material : Nitrile FEATURES 6-3/16 in Dia maximum impeller For 4030, 4280, 4300 and 4380 series pumps