An attempt to save a indirect fired water heater

[@OchsSlayer]

We call those T&P.

[@wickedkool705]

I am wondering why not pro press for the prv?

[@HVACHOUSEHOLDER]

Because the prop press fittings are expensive. And it is gluttony to wast them on prv

[@sydneygray986]

It's a t&p (temp and pressure) relief valve. Not a prv (pressure reduction valve). :)

[@davidmiddleton9191]

Either Teflon tape or pipe dope