So I had a plumber over to take a look. This guy said he'd have to come back since I "ovalled" that stem nut. $700-$800 to install whole new shower setup (if I buy it), $1,100 to put his in with anti scalding. I do not have a shower outlet now - it's an old setup off fawcett with hose up to shower unit.
I'd like to weigh my options here before throwing good money after bad here.
Any trick to get that ovalled piece off so I can at least block leak? There are no shutoff valves I can find. Here is pic of that closet access. Was hoping to see shut off.
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Wish I'd seen that before I used adjustable wrench
i cant open the picture so i cant see how much of the stem nut is damaged, but they are pretty deep so if you were using an adjustable wrench there should still be enough good to get a socket wrench on it, they sell them a all hardware stores i dont know the size off hand of the one you need though, they have kits with all sizes also. http://www.homedepot.com/p/HDX-Shower-Valve-Wrench-Set-UWP0001J/204284870 a picture would be helpful. if the stem nut is outside the wall and not inside you could use a pipe wrench or channel lock on it, if you have access from the rear you can do the same from there. if the stem is not completely frozen in you could try a pipe wrench directly on the stem you will for sure ruin the stem and maybe break it off but it might just twist it out.