A properly functioning T&P relief valve is the last line of defense against a dangerously over-pressurized or overheated water heater. The Camco 10421 is factory-calibrated to open at 150 PSI or 210 deg F -- whichever threshold is reached first -- venting pressure before damage or rupture occurs. The 4-inch epoxy-coated probe resists the mineral buildup and corrosion that commonly causes valves to seize or weep prematurely in hard-water conditions.
Water heater T&P valves are a code-required safety component -- and a commonly overlooked maintenance item. Camco's 10421 replaces aging, seizing, or dripping relief valves on a wide range of 6-gallon and 10-gallon RV water heaters as well as standard residential tank-style heaters that use a 1/2" NPT inlet port.
The brass body and stainless steel spring resist the corrosive environment inside a hot-water tank. The epoxy coating on the 4-inch probe adds a layer of protection against lime scale and mineral deposits that can lock a probe in place and prevent the valve from opening when needed.
Opens automatically when water temperature hits 210 deg F or system pressure reaches 150 PSI -- whichever limit is exceeded first.
Durable brass housing with a stainless steel spring resists corrosion and maintains accurate calibration over years of service.
4-inch probe has an epoxy coating to resist mineral scale buildup, helping ensure the valve can open freely when needed.
Female 1/2" NPT inlet and male 1/2" NPT outlet fit the vast majority of RV and residential water heater T&P ports without adapters.
The 10421 is a direct-fit replacement for T&P valves on popular RV water heaters including Suburban and Atwood (Dometic) 6-gallon and 10-gallon units that use a 1/2" NPT relief port. It also fits residential water heaters rated for 1/2" T&P connections where a 150 PSI / 210 deg F rating is appropriate.
T&P valve replacement is a straightforward DIY job for most RV owners, but a few details matter: