Boat owners and mechanics, this water pump impeller is one of those essential spare parts you should always have on hand! This specific impeller (part number 18777-0001) replaces a ton of different models across multiple brands - we're talking Jabsco, Yanmar, Volvo Penta, CEF, ANCOR, Mallory, and more. The specs are important: it's a spline drive design with 12 splines, has 10 neoprene blades with a brass hub, measures 2-1/4 inches in diameter (57.5mm) with 2 inch depth (50.8mm), and fits 5/8 inch shafts (15.88mm). The neoprene material is durable and flexible, which is crucial for proper water pump operation. This thing fits so many different marine engines and pumps - Jabsco models like 22110, 22400, 22740, 23800 series; Yanmar applications; Volvo Penta systems; and engines from GM, Ford, Indmar, Lancing Marine, Lugger, MAN Diesel, Mermaid Marine, MWM, and the list goes on. If your engine's cooling system isn't working properly, a worn impeller is often the culprit. Having a spare could save your day on the water. Always good practice to replace impellers annually or every couple of seasons depending on use. If you're unsure about compatibility, definitely provide your engine serial number to confirm. This is one of those boat parts that seems small but is absolutely critical for keeping your engine from overheating. Every serious boater should keep one in their onboard toolkit!
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