1、OE Number: The referencing OE number of this engine circulating water pump are 17437, 60658, 8503991, 811841, 850399, 985429, 980477, 382218, 3853850, 383953, 856364‑5, 3853850, 835390‑6, 8563645, 8353106, RA057018. 2、Fitment: The engine circulation pump is a replacement for Mercruiser, for Crusader, for Indmar, for Marine Power, applicable for 4.3L V6 and 5.0,L 5.7L V8 engines with either steel or plastic timing covers. 3、Bi Directional Impeller: These circulating pumps have a brass bi directional impeller, which means they can be used on engines of either rotation direction. 4、Perfect Replacement: Ideal for refurbishment replacement of the original ageing and damaged circulation water pump. No modification needed, it's a perfect fit for your boat. 5、Durable and Efficient: The engine circulation pump is durable material can resist daily wear and tear, ensuring reliable operation and a longer lifespan.