JOHNSON PUMP IMPELLER F5B 1/64 LONGERImpellerPump:F5Material:MC97 (for cooling)Outer Diameter:2.25Inner Diameter:SplinesWidth:1.24A 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.