New Impeller Kit includes impeller and two o-rings Replaces impeller kit for 1" Magnaflow pump , Glenwood's part number is 60001 Magnaflow 500-1000 These are used on a 1" Magnaflow water pump. Glenwood's part number is 60001. Impeller: 1.975" thick, 2.570" diameter, 8 blades Bronze Insert: .625" diameter through hole, .188" keyway, 2x counter bores on each side of impeller measuring 1.110 diameter by .165 deep. With another counter bore below that to the bronze insert .900 diameter by .155 deep. O-Rings: 2 pieces. .065" thick, 2.570 inside diameter, 2.700 outside diameter.