bad idea. If one isn't working, the water from the other pump will run back through the non working one, back into the boat. I've seen people try to use check valves to prevent this, nearly always causes problems. Check valves are notorious for failure in salt water, way too unreliable. Some big boats run several different kinds of water sources into a big plenum with one discharge. Also bad idea. If the single discharge gets clogged, they end up with water in places it ain't supposed to be.
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