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Good to know that's what the "lf" means. This is the model I would use. I guess the original is old enough to not carry the "lf" in the model number. https://terrylove.com/watts.htm

I'm certain it's not under 80 which is why I've got to get the plumber out to install a new PRV and T/P valve. I think the PRV swap out is beyond my skill set. That said the old one and new one I plan to use are the exact same model and are FPTxFPT so even for me it wouldn't be that hard. Old...

Well, that's what started this all. I was about to leave town and noticed the T/P valve leaking. Turned the gas off to the heater, closed the inlet valve and left the extension pipe in a bucket once it stopped leaking. Came back home, fired up the heater, turned the inlet supply back on and...

I don't currently have an expansion tank. House built in '78 and the last time they replaced the water heater (before I bought the house) they didn't bother to add one. So should I try the expansion tank first then a new PRV?

I did a quick forum search and I'm not sure I have the same issues others have had with needing to install expansion tanks. When I turn on either hot or cold (or mixed) the initial pressure is somewhere around 150psi (confirmed with a gauge at the hose outside). Then after 10-20 seconds or so...

In my very limited experience sliding a no hub coupling isn't exactly easy. Unless I used some sort of grease I'm not sure I could do what you describe. I know that's the general method for a tight fit situation like this where gluing a fitting won't work. Perhaps there's a more manageable no...

Thanks everyone.

This is true. My only experience with a similar situation is with irrigation PVC but in that case I've always been able to dig back more dirt to get the flex I need out of the pipe. I do realize the Fernco isn't ideal but the typical no hub couplings are only wide enough to cover about an inch...

Thanks Terry. I hastily posted this from my phone originally, but I've now edited the OP with pictures and a (hopefully) better description of the issue. Note that the section is question is 13 inches, not feet (whew).

EDIT: Bathroom remodel. ABS stack between kitchen adjoining kitchen san tee and toilet/bath san tee was cracked all the way down (1978 house). Replaced a large section of the stack, including kitchen san tee & trap rough in and I'm now working on roughing in the bathroom DWV piping. I'm...