Johnson Pump F98 Impeller Neoprene. 74" Inner Diameter:Splines Width:7.09" A worn or damaged impeller can cause system failure or engine breakdown. SPX's Johnson Pump brand impellers are developed and manufactured for maximum flow and long life. With a genuine spare impeller you can also be sure that you are getting the quality required by engine manufacturers and professionals. Specifications for Johnson Pump 09-842B F98 Impeller Neoprene: Manufacturer: Johnson Pump Color: Black Package Contents: Johnson Pump 09-842B F98 Impeller Neoprene Johnson Pump 09-842B: F98 Impeller Neoprene 09-842B