From Hansen's Harbor
Allen Hansen
A tip about when you install household faucets on your boat. When they are installed they have a check valve or back flow preventer. Which means when you are winterizing and vacuuming the whole system to the hot water heater, those faucets will not drain because of the back flow preventer. So you have to go to the faucet head and vacuum there. If you fill your system full of antifreeze and pump than no worries it all goes through.
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