12 blades 5/8" shaft · diameter 2 1/4". 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, causing leaks, and they can be dangerous in confined spaces. Replaces Johnson Pump Impeller number 09-1027B.