How do you remove the old pressure balancing unit, (cartridge), from an american standard pressure balancing bath and shower body cartridge # 077171-0070A
Does it pull out? Or do you turn it and pull?
Turn off the water to the shower.
Remove the handle cover (it should pop off)
Remove the center screw (usually phillips head)
Remove the retaining clip holding cartridge in - you can use a pair of long nose piers or a small screwdriver
Grab the cartridge with a pair of pliers and pull straight out. It may require a little force - there are O-rings around the cartridge to keep it from leaking.
Check the cartridge bore (the hole where the cartridge was removed)
Clean any debris or scale - lime away or CLR will work
Apply a little bit of soap around the new cartridge to help it slide in easier. Push it all the way in and make sure it is seated. Re-install the clip (you should have received a new clip with the replacement cartridge)
Turn the water back on a check for leaks
If OK, reinstall the knob screw, and cap.
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