Help Identifying American Standard Shower Faucet

Hello,

I need help identifying an American Standard shower faucet from the late 70's or early 80's. The shower is unused but the cartridge needs to be replaced as it is leaking.









Thank you very much!

It is the "push/pull" valve. It uses a spring and stem with a rubber seal. It doesn't have a "cartridge". Once you open the drywall a little more, you will find the operating mechanism is secured with two bolts. There will be two "caps" on the top which give you access to the stems under them.