Yamaha - Pressure Control Relief Valve Engine Cooling System Component 60H-12416-00-00. Overview. When you spend enough time working around Yamaha outboards, you start to appreciate how much the cooling system depends on the smaller components doing their job. The Yamaha Pressure Control Relief Valve 60H-12416-00-00 helps regulate cooling system pressure so water moves through the engine the way Yamaha designed it. It plays an important role in keeping temperatures stable during long runs or hea