I have a leaking shower faucet so I went to the local plumbing supply store, spoke to the owner and left with two new valve cartridge parts to replace. I have never done this type of repair before so I was hoping to get some clarification. I have attached several pictures including the type of Gerber handle (single), the current valve cartridge, and the two new parts I was provided. My question is whether the old parts just pull straight out and the new ones slide in or if there is more to it than that (such as removing additional pieces from the handle.
I would appreciate any insight that can be provided. I have to shut off the water for the entire 6 unit building to make the change so I want to make sure I understand what I should be doing. Thanks!