Keeping an outboard running at the right temperature isn't just about pushing water through the system - it's about managing flow when conditions shift. That's exactly what the Mercury Marine Poppet Valve Assembly - 8M0114707 is built to handle. This small but essential part regulates water flow through your cooling system, opening up when your RPMs climb and dialing things back at lower speeds, ensuring your engine runs right where it should - not too hot, not too cold.. Engineered specifically for select Mercury outboards, this poppet valve assembly fits like factory because it is factory. The precision-molded design opens and closes smoothly, adapting to the cooling demands of the engine in real time. It's built from corrosion-resistant materials that hold up to saltwater exposure and the constant pressure cycles that come with hard running. Whether you're chasing down an overheating issue or just staying ahead on maintenance, a fresh poppet valve helps keep cooling performance dial