If your city water connection is causing your fresh-water tank to overflow, get a new check valve. Install this check valve to stop water from backing up and keep it flowing in the right direction.
Replace the leaking check valve in your RV's fresh-water system to prevent backflow and keep antifreeze from leaking into your water heater. Brass construction won't rust. Valve has both 1/2" MPT and 1/2" FPT ends.
If your city water connection is causing your fresh-water tank to overflow, get a new check valve. Install this check valve to stop water from backing up and keep it flowing in the right direction.
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