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It fits gear housings with a flush, screw-in design, so make sure your housing matches that configuration before ordering.\u003c\/p\u003e\n\u003cp\u003eIt's a direct replacement for Mercury OEM part 48748A1. The base forms the foundation of the water pump assembly, sealing against the gear housing and providing the mounting surface for the pump components above it. 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The base is the foundation of the water pump assembly, bolting to the gear housing and providing the sealing surface and mounting platform for the pump components above it. A cracked or warped base is a reliable source of cooling water leaks at the lower unit, and it's a part worth inspecting any time the pump is apart.\u003c\/p\u003e\n\u003cp\u003eIf you're doing a water pump rebuild on one of these V6 engines and the base shows cracks, erosion, or a damaged sealing surface, this is the replacement to reach for. 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