Water Pump for Yanmar Johnson Pump 2GM20-YEU, 2GM20C-YEU 3GM30-YEU, 3GM30C-YEU 10-13337-01 66260538A raw water pump, also known as a seawater pump or an engine cooling pump, is responsible for pumping seawater into the boats cooling system to prevent the engine from overheating. It draws water from outside the vessel and circulates it through the engines cooling system, ensuring that the engine maintains an optimal operating temperature. OE Number 10 24509 01 , 10 24509 02 , 10 13337 01 , 10 13492 01, 128377 42500 , 128397 42500 Fit for the