https://www.boatus.com/expert-advice/expert-advice-archive/2013/july/how-to-winterize-boat-plumbing
How to Winterize Boat Plumbing | BoatUS
Plastic plumbing fittings, pumps, and marine heads, engine or exhaust manifolds can all be cracked and damaged by freezing water and ice.
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https://boatpartsmatch.com/boat-plumbing/oasis-marine-3700-gph-12v-submersible-electric-boat-plumbing-bilge-pump-1-12-outlet-2-marine-heat-shrink-wire-connectors-included/
Oasis Marine 3700 GPH 12v Submersible Electric Boat plumbing Bilge Pump 1 1/2 outlet 2 marine heat...
Jun 2, 2017 - Heavy duty construction for both commercial and pleasure boat use; known for trouble free operation and reliability. 1-1/2" (38mm) discharge outlet. 12 Volts...