The ROP Shop replacement Water Pump Impeller Repair Kit for Mercury 4 HP 1 Cylinder 5595532 & Up Outboard. Specs - Impeller (Inside Diameter): .456". Refer to images 2 & 3 for more information. Includes - (1) Impeller, (1) Face Plate, (1) Drive Key, (1) Water Guide Tube & (3) O-Rings; comes as shown in the first image. Fits/For 1975-1985 Mercury, Mariner 4, 4.5, 7.5 & 9.8 HP 2-stroke outboard boat engines with .456" inside diameter impeller. Designed for durability to provide higher flow rates and cooling flow to protect your engine. Impeller elastomers provide improved flexibility across broad temperature ranges throughout the boating season.
