Plumbing Questions? Ask a Plumbing Expert.
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.
Do you mean the relief valve on the water heater?
I need some clarification as to what you mean by a "pop off valve"
A "pop off valve" is not a plumbing term. I have a solution for you but until I know for sure what you're referring to I can't give you an answer specific to your situation. There are several possibilities.
How about we start with where this valve is located