Always use Sherwood"s impeller to ensure maximum performance of your pump. Kits include: all gaskets, o-rings, and a new technical service guide Impeller kits are the same price as a single impeller Sherwood"s unique compound ensures long life Neoprene impellers perform well because of their great elasticity, they snap back really well Neoprene maximum temperature: 130F One impeller will fit more than one pump