The problem with these pumps is that they fail quickly, especially in salt water. The small rotor or fan at the bottom of the pump is attached to a short shaft that spins, causing water to "pump" through the system. The problem is that the shaft rusts and breaks and you have a running motor but a pump that has stopped pumping water. I've had the boat for over 10 years now and I change the pump at least twice a year. The last exchange only lasted 2 months. The reason I keep buying and replacing this particular pump is because I'm going to have a hard time swapping out the fittings that go through the hull when I'm keeping the boat on the water. A simple stainless steel shaft would probably extend the life of the pump, but then you wouldn't have to replace it as often.
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