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Every RV water heater needs a working temperature and pressure relief valve, and this Camco replacement is preset from the factory so there's nothing to adjust. It threads into a 1/2" NPT port and extends a 4" probe into the tank to monitor conditions directly.
The valve opens automatically at 150 PSI or 210°F to release pressure before it becomes a problem, and the coated construction resists corrosion over time.
A straightforward safety-valve replacement to keep on hand for water heater maintenance.