Your water pump should be off before adding the anti freeze.
Rv water heater check valve.
Valterra 1 2 inch p23415lf brass 1 2 check valve x mpt.
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Rv hot water heater check valve the check valve line is where the rv and the city water first meet.
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Camco water heater tank rinser cleanses and removes sediment that collects at the bottom of rv water heater extends life of rv water heater 11691 4 6 out of 5 stars 3 210 12 01 12.
As long as you flush the water heater out once or twice a year this too shouldn t be a problem.
Aqua pro 20818 1 2 x 1 2 lead free male check valve.
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Having a check valve at the cold inlet to the heater also prevents mineral deposits and residue from backing into the cold system from inside the water heater.
This needs some anti freeze too.