The Waterco Silicone Carbide Seal For Saltwater Pumps is primarily designed for saltwater environment or applications. This is made with hard material making them suitable for abrasive applications which wear out other seal face materials prematurely. When this is combined with carbon faces such as in a non-abrasive application, the frictional characteristics minimize the energy required to turn the pump which is equal to lesser costs in to run your pump. This seal suit Aquamite, Aquastream, Hydrostorm, Hydrostorm Plus, Hydrostorm ECO 3 Speed, Hydrostar, Hydrostar MK3, Hydrostar 350, Hydrotuf, Superstream, and Supatuf pump models.