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Old 12-15-2020, 07:03 AM   #6
jhall767
Senior Member
 
City: Middle River MD
Join Date: Dec 2019
Posts: 102
The exact item you are looking for is a water heater expansion tank. Required on residential water heater installs in most locations now. Home Depot, Lowes etc have them.

This is assuming that there is nothing wrong with your T&P valve. Which there may be. Also if you use engine heat to heat the water you could be going over temperature for the valve.
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