Sherwood® 23974 major water pump repair kit, suitable for the following pumps: P1711, P1712, P1716B, P173 , P1719, P1719F P1722B, P1727FB, P1730F, P1731F The Mechanical Seal in this kit is suitable only if you have the original factory shaft.   Must be able to see the retaining ring when impeller is removed. This kit contains:  Impeller 17000 O-ring 15945 Key 19209 Snap ring, small 15952 Bearings 15951 Seal & seat 15955 Lip seal 21776 Wear plate 24162 Cam 18271 Water pump cover 18742 Retention plug key 24626 Impeller specifications: Diameter: 3-1/4" ~ 82.55mm Width: 2-7/8" ~ 73.00mm Shaft: 20.00mm Blades: 12  Keyway: 3/16" ~  4.70mm (threaded) Material: Neoprene