Johnson Pump F7 MC97 Impeller Kit 2.56 SPX Flow Johnson Pump marine brand impellers are developed and manufactured for maximum flow and long life. Replaces Jabsco No 17937-0001. Features Includes gasket, o-ring, and 7gms impeller lubricant Stable pressure delivery over time Significantly longer service life Excellent self-priming capability Minimized swelling Minimized failures due to fatigue Correct impeller dimensions Correct cooling flow sufficient cooling directly at start up Specifications