My bathroom shower faucet is leaking. I opened the cover plate but I can not pull out the central cartridge no matter how hard I tried because I think it is locked by the cartridge retaining clip (U) which is attached to the inside “Stop Tube”. This Stop Tube is fixed and I have no way to remove or pull out it from the wall. ( Last time a plumber used Moen Magnum Replacement Cartridge 1225).
I am wondering if anyone can teach me how to pull out the Stop Tube, the U Clip and the cartridge so I can replace it. Please help and really appreciated.