TOHATSU PARTS | DISCONTINUED RELIEF VALVE (UP) | 3B7-77440-1 | |This Genuine Tohatsu Marine Part is a discontinued relief valve (UP) with the part number 3B7 77440 1. The relief valve is an essential component in the engine's cooling system, responsible for regulating the pressure and preventing any potential damage or overheating. Although this specific relief valve is no longer in production, it is still a genuine Tohatsu part, ensuring high quality and compatibility with your marine engine.