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Winterizing an RV water heater the right way means bypassing the tank first, otherwise you're pouring several gallons of antifreeze straight into a compartment that doesn't need it. This brass valve assembly gives you a dedicated bypass point so switching between normal use and winterizing mode is a matter of turning a few valves instead of disconnecting hoses.
Once it's installed, seasonal winterizing and de-winterizing become a quick valve turn instead of a hose-disconnecting chore.