American Standard Town Square S 2.5 gpm/9.5 L/min Shower Trim Kit With Single Function Showerhead, Double Ceramic Pressure Balance Cartridge With Lever Handle - AMS-TU455501

Trim only. The TU455501 is a shower trim kit, which means the escutcheon, lever handle and single function showerhead you see on the wall. The rough-in valve body has to be ordered separately, so on new construction or a full gut you need a pressure balance valve body in addition to this kit. On a remodel where the existing American Standard pressure balance valve is staying in the wall, the trim is all you buy.

The showerhead is rated 2.5 gpm (9.5 L/min). That is the US federal maximum, so it works in most of the country, but it will not meet the tighter 1.8 gpm ceilings that California, Colorado and some other jurisdictions and green building programs enforce. If you are speccing into one of those markets, you need a lower flow showerhead on the same trim.

Pressure balance. It runs a double ceramic cartridge that puts a ceramic disc mixing valve and a ceramic balancing spool in one piece. The spool holds output temperature steady when hot or cold supply pressure changes, which is what protects against a toilet flush scald. It does not hold a set numeric temperature the way a thermostatic valve does, and there is one handle, not separate temperature and volume controls. If the spec calls for thermostatic with independent volume control, this is the wrong trim.

Yes. The cartridge has an adjustable hot limit safety stop that caps how much hot water can enter the mix, which is how you dial back scald risk in student housing, senior living or a rental you do not control. It is set at the valve during trim-out, not by the occupant. The Comfort Zone design also widens the usable handle sweep so the tenant can fine tune within that reduced range instead of fighting a narrow band.

No. The cartridge has back-to-back capability, meaning hot and cold can be reversed at the cartridge quickly rather than re-piping. That covers the common case of a back-to-back bathroom layout where the supplies land on opposite sides. Integrated check valves in the cartridge also stop cross flow between the hot and cold sides, which is what causes the classic cold water creeping into the hot line complaint in back-to-back installs.

Three finishes: chrome (TU455501.002), polished nickel (TU455501.013) and brushed nickel (TU455501.295). The suffix after the decimal is the finish code, so a property manager standardizing across units only needs to record that three-digit ending. There is no matte black or bronze in this trim.

The application covers shower and tub. Bear in mind the kit itself supplies a single function showerhead and the lever handle trim, so for a tub/shower you also need a tub spout with diverter and a valve body that has the spout outlet. Order the spout in the same finish code so it matches.

Maintenance comes down to one part. The mixing valve and balancing spool are combined in a single cartridge, so a service call is one pull and one replacement rather than sorting two components. Ceramic is not affected by mineral deposits or harsh water, which is the usual failure mode for pressure balance units in hard water buildings, and the ceramic disc mixing surfaces are what keep the handle from getting stiff or dripping as it ages.

It is a lever handle. A lever is the operable type generally specified for accessible bathing facilities because it works without tight grasping, pinching or twisting of the wrist. That also makes it the easier choice for senior housing and healthcare washrooms where a round knob gets complaints.