Pre-molded hose takes the struggle out of installation Cooling hose routing can be challenging. Space restrictions and tight bends make using conventional hose impossible without constricting water flow and skinning knuckles. Molded hoses designed for specific applications are the solution. Sierra offers a selection of hoses engineered to match manufacturer specifications and make installation easy.This molded hose is designed for use on circulating pumps on 4.3L, 5.0L and 5.7L engines. Pre-molded bends allow for maximum water flow and end alignment takes the struggle out of connecting to pump and engine ports. To take the frustration out of hose installation, use a Sierra molded hose. Key Features Pre-molded to simplify installation Allows for maximum water flow while making tight bends Compatible with 4.3L, 5.0L and 5.7L engines as well as some outboards; see the list below or our Engine Parts Selector to confirm this part is right for your engine. Backed by SeaStar Solutions Limited Two-Year Warranty The Sierra Engine Parts Selector In addition to circulating hoses, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.ApplicationOEM Part NumberJohnson/Evinrude Outboard312781Mallory9-44052MerCruiser Sterndrive32-33189, 32-33189A1OMC Inboard312781OMC Sterndrive312781