I'm trying to replace a shower cartridge to fix a low water pressure issue in my mother's house. There are no brand names to google and I can't check for a clip to remove because I believe the bezel is stuck. Any ideas? I took a video so check this link for a better idea. Tonight I'm going to take a huge wrench to it and try to unscrew on the inner pipe bit where it looks like there's a spot to grip it
It looks like all you need to do after you turn off the water is to use a pair of channel locks on the nut on the front. A little WD40 might be needed.– HoneyDoJul 24, 2021 at 0:21
So not the plastic knob that's part of of the cartridge but the pipe that it's sitting inside of?– Craig mJul 24, 2021 at 1:41
I know, I'm talking about the large brass fitting. It appears to have flat edges that you can grip with channel lock pliers. It was hard to tell in your video because of the movement of the camera.– HoneyDoJul 24, 2021 at 1:51
Ill take another video, but that bit looks like the pipe and not a fitting. I'm worried that it is connected to the main pipe and I'm worried taking channel locks to it could cause it to rip it out and cause a situation where I have to call a plumber to resolder it.– Craig mJul 25, 2021 at 21:39
I just looked at the video again. Although it's jumping around a bit you can see the flat edges of the brass fitting so it can be gripped with a wrench or channel locks. I would spray it good with WD40 and put channel lock liers on it to turn that fitting.
To be on the safe side you will probably want to secure the valve body with a plumbers wrench while you unscrew the fitting counter-clockwise with the channel locks. That will keep you from putting excessive pressure on the plumbing fittings.
Once that fitting is off you will have access to the cartridge.
Again, make sure you turn off your water supply first!