American Standard Portsmouth Single Handle Thermostatic Shower Valve Trim Kit with Cross Handle - AMS-T420732

No. The Portsmouth T420732 is trim only, sold less valve. You need an American Standard R510 or R530 thermostatic rough-in valve behind the wall to complete the installation. If you are replacing trim on an existing shower, confirm the rough-in already in the wall is an R510 or R530 before ordering.

Oil Rubbed Bronze, ordered as T420732.224. That is the finish suffix to quote if you are matching other Portsmouth fittings in the same bathroom or across a unit turnover.

A thermostatic setup like the Portsmouth T420732 uses a wax thermostatic element that shuttles between the hot and cold seats to hold a temperature you dial in, rather than simply balancing pressure between the two supplies. Practically, that means the water stays at the temperature you set even as supply conditions shift. It also carries an adjustable hot limit safety stop so you can cap how much hot water mixes in, which is what reduces scald risk in hotel, senior living, and multi-family showers. The tradeoff is that it requires a thermostatic rough-in valve, not a standard pressure balance body.

Yes. The Portsmouth thermostatic system includes integrated stop valves, so the shower can be isolated at the valve for cleaning or cartridge service instead of shutting down a riser. That matters on multi-family and hotel work where killing water to a stack is a scheduling problem.

The Portsmouth T420732 thermostatic trim is rated for shower and tub application. Note it controls temperature only, so a tub spout or diverter and the shower outlet are handled by the rough-in valve and additional fittings, not by this trim.

Spring-loaded check valves on both inlets. Hot and cold each pass through a check before mixing, which stops cross flow between the supplies, a common cause of lukewarm water at other fixtures on the same branch.

Metal. It is a cross handle, and the fitting is brass casting, which is the material property property managers care about for high-turnover showers where plastic handles crack and get replaced.