Sherwood® 23981 major water pump repair kit, suitable for the following pumps: G151 [StarPower inboard engines] G155 [StarPower sterndrive engines (StarPower 800790MI)] G157 [Marine Power engines] G1508, G1508-01 GC1, GC1-01, GC4, GC5, GC5-01 This kit contains:  Impeller 15000 O-ring 12231 Key 04432 Snap ring, small 04258 Bearings 12211 Snap ring, large 04259 Seal & seat 12314 Washer 04264 Cam 18398 Wear plate 12856 Washer 19996 Screw 19995 Gasket 12855 Impeller specifications: Diameter: 2-9/16" ~ 65.00mm Width: 2" ~ 50.80mm Shaft: 5/8" ~ 15.90mm Blades: 12  Keyway: 3/16" ~  4.70mm Material: Neoprene