American Standard Temperature Control Pressure Balance Valve Cartridge - AMS-A954440

It's the temperature control pressure balance cartridge for an American Standard shower valve, MPN A954440-0070A. The pressure balance element is the part that senses a pressure drop on the hot or cold side (someone flushes a toilet, a washer fills) and throttles the other side to hold the mix steady, so the shower doesn't scald or run cold. When a tub/shower valve starts swinging in temperature or won't hold a setting, this cartridge is the wear part that gets replaced rather than the whole valve body.

Repair part only. The A954440 is the internal cartridge, not a valve body and not a trim kit. It goes into an existing American Standard pressure balance valve already roughed into the wall. If you're building a new shower, you need the valve body and trim as well; if you're fixing one that's misbehaving on temperature, this is the piece that comes out.

Only for the openings that already take this cartridge. American Standard has used several distinct cartridge families across its tub and shower valves, and a pressure balance cartridge is not interchangeable with a thermostatic or a two-handle stem unit. The reliable way to standardize is to pull one cartridge from a representative unit and match it to A954440-0070A, then buy against that number for the rest of the fleet that matches. Where units differ, they'll need their own part.

That's the classic symptom of a failed pressure balance element, and this cartridge is the part that element lives in. The balancing spool inside can seize with scale or debris and stop compensating, which leaves the shower swinging with house pressure. Before you order, confirm the valve is a pressure balance type rather than thermostatic, and that the supply stops and screens aren't the real restriction. If it's the balance unit, A954440-0070A is the replacement.

Match the part number off the old cartridge. American Standard prints or casts an identifier on most service cartridges, and A954440-0070A is the one this part answers to. If the old unit is unreadable, count the handles and identify the valve type first: this is a single-handle pressure balance cartridge, so a two-handle valve or a thermostatic mixing valve takes something else entirely. Getting that right ahead of the truck roll saves the second trip.

No finish options, and none are needed. The cartridge is sold as a single unfinished part because it lives entirely inside the valve body behind the wall. Finish only matters on the trim, the escutcheon, handle and showerhead you actually see. Order the one part number, A954440-0070A, regardless of what your trim is plated in.

No wall work. A shower cartridge is serviced from the front: pull the handle and escutcheon, remove the retainer, and draw the cartridge out through the valve body. You do need the water off to that riser, which in multi-family usually means the in-wall stops if the valve has them, or the branch shutoff if it doesn't. Nothing about the cartridge itself requires cutting tile.

The temperature limit on an American Standard pressure balance valve is set by the limit stop on the valve stem or trim adapter, not by the cartridge body itself. Replacing the cartridge restores the balancing function and gives you a fresh limit stop to set against, so after installation you reset the stop to your target maximum with the water running before the trim goes back on. That reset step is where most callbacks come from on this repair.