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: Material: MC97 for cooling; Outer diameter: 2.56"; Inner diameter: 8 splines; Width: 1.98"; Application: Mercury Marine 4Cyl, 6Cyl engines; Volvo Penta; Yanmar; Kohler;