Impeller Kit. Material Neoprene. Drive Type Spline Drive. Number of Blades 12. Dimensions Diameter 3-3/4 . Shaft Width 1 . Shaft Diameter 3-9/16 . Insert Material Brass. Jabsco flexible impellers can be fitted to most makes and models of bronze flexible impeller engine cooling, bilge, transfer and general purpose pumps. Jabsco flexible impellers are subjected to rigorous quality processes to ensure reliable, efficient and long lasting performance. Replace all impellers at least once every year, or sooner, depending on the engine duty. When the installation is correct an impeller may last for several years, but it is always advisable to stick to a schedule of preventative, rather than corrective, maintenance. Replacing impellers is easy. By removing the end cover screws, it is possible to remove the impeller by using either a Jabsco Impeller Removal Tool, or channel lock pliers, to grip the hub of the impeller. Don t use screwdrivers as they may damage the face of the pump body, ca Material Neoprene. Drive Type Spline Drive Number of Blades 12. Dimensions Diameter 3-3/4 . Shaft Width 1 Shaft Diameter 3-9/16 . Insert Material Brass Jabsco flexible impellers can be fitted to most makes and models of bronze flexible impeller engine