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I assume you mean a relief valve on a hot water tank. According to the tag on it it should be "popped" once a year by the home owner or a professional (Be careful not to scald yourself if you choose to do this yourself, the water is HOT) to ensure proper function. Proper function means it holds water properly after it has been "popped".

It may leak after it has been opened. That can normally be fixed by popping it open a few times and washing any debris out of it. There is no guarantee however that it wil reseal properly. If it fails to stop dripping it must be replaced. NEVER CAP A DEFECTIVE RELIEF VALVE. See YouTube mythbusters video on blowing up a hot water tank to see why.

The tag says that it should be inspected by a Plumbing professional once every 3 years. If it is not working properly that it should be replaced.

I have replaced relief valves that were 2 years old, however, I have seen 20 year old tanks that still had the original relief valve on it. So to answer your question if it leaks or fails to open on its test, replace it. If not then don't.

The correct way is to REMOVE the T&P every three years and physically inspect it BUT since it is already out may as well as replace it

If your going to ask a "plumber" about safety devices ask them if they took the ASME section IV course or studied the NBBI code and are the familiar with NFPA 54

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14y ago

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