Sherwood® 23973 minor water pump repair kit, suitable for the following pumps: P171  P1710-02 , P1710A , P1710X  P172 , P1726 . P1726X  P1732-02 , P1732A , P1732X  P176-02 , P176X The newer Sherwood pumps have a press on mechanical seal.  If you have a retaining ring and a washer holding on your mechanical seal then the seal in this kit will not fit. It is easy to verify this as soon as you remove the impeller. This kit contains:  Impeller 17000 O-ring 15945 Key 19667 Snap ring, small 15952 Seal & seat 15955 Lip seal 21776 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