Shower valve, off/on shut off

er78mph

Almost done remodeling entire bathroom and figured out that I needed to change the plumbing in order to install a new shower on/off valve. I kept the same plumbing thinking all was universal! Is this a HUGE issue? Or should i be able to fit a new valve with current plumbing?? Cement board, redgard, tub, and tile are all in!! I can easily access the plumbing through the back drywall but I rather not . Thank you all in advance and hope one of you guys can bail me out!! Thanks! I will.attach a



picture!!

joecaption

Your trying to do this backwards, should have been plumbing then the tile.
No such thing as a "universal" contorl valve there all a little differant.
Everything has to be done behind that wall.
If there's old steel supply lines that should have been replaced with copper, Pex or CPVC long ago.
Make sure you remove the shower head before turning the new valve on. There will be trash knocked loose inside the pipes.

TheEplumber

If you want change the valve you'll need to access the h&c supplies- perhaps from the back. If you just want to change the cartridge you have the room for that. Turn off the water, relieve the pressure. Pull the keeper pin in the picture and then you pull out the cartridge. Install in reverse order and you're done.
But right now your tile is too tight to the valve. You've covered the trim plate screw holes.

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joecaption

I just use a Roto ZIp with a tile cutting bit when I find one like that.