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Thanks for letting me what this valve is. But now I’m wondering why do you need a thermal expansion relief valve in addition to the Thermal pressure relief valve?

The pop off valve you’re talking about is actually the vacuum relief valve. On further inspection I found the TPR valve on the side of the tank.

I’ve figured now It is definitely a shutoff valve with a drain with pex going to house drain but what is the cap at the end for?

Is this the pressure relief valve on this tank I circled it in yellow? I’ve only seen the prv in the centre of the tank or the side of the tank before . It’s also coming off the cold side. I don’t thing it is the Prv, but what is it and why does it have line running to the house drain?

Thanks Terry so there should be no problem teeing in to the existing line underground and running the pex from the tee, with the crimp fittings.

Hi I have a house in Phoenix Az. I want to run a Pex waterline from the front of the house to the back for the pool water supply. There is a pool waterline at the back right now but it comes from the house. The house is vacant quite often and i would like to be able to shut the house water off...