1.This impeller kit is compitable with Jabsco Jabsco 224050001P, Johnson F35B 09808B1, Volvo Penta 8755837 833995 3586496 21951342, Westerbeke 032620, Onan 1320310, Vetus IMP00701, CEF 500121 and many other marine engine cooling water pumps. 2.IMPELLER SIZE: Overall Diameter 40mm, Width 19.2 mm, Shaft 12mm. Neoprene, 6 Blade, Brass Insert with slotted shaft pin. Impeller kit includes impeller, gaskets and Oring. 3.You should replace your flexible pump impeller at least once every year or sooner depending on the engine duty. It is one of the most vital components of the engine cooling system and should always be treated as such. Always carry spare impellers on board before boating sports. 4. flexible neoprene impeller is suitable for marine waterpumping duties such as engine cooling, water transfer, wash down and bilge water pumping purposes, work for fresh or sea water. Flexible impellers are subjected to rigorous quality processes to ensure reliable, efficient and long lasting performance. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.