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I think it is another pressure relief valve after comparing others on the web. Thanks for pointing me in the right direction. Just wierd that I have two (the t&p and this one).

The Temperature Pressure Relief Valve is not the problem. I just replaced that. It is the other one coming from the cold inlet that connects to the copper tubing right after the TPR. Are you saying it is called a vaccum breaker?

I am having a problem with leaking outside of my drain pipe from the water heater. I just replaced my TPR valve and noticed that there is still leakage. It must be this other little valve on the cold water inlet. It sounds like water is running through the pipe and there is no leakage except the...