American Standard Ultima Touchless Sensor Toilet Flush Valve, Diaphragm-Type, 1.6 gpf/6.0 Lpf, 11-1/2-inch Rough-In - AMS-6147SM161

The Ultima 6147SM161 is an 11-1/2 inch (292 mm) rough-in valve, measured from the wall supply to the bowl spud. If your existing carrier or supply stub is set for a different rough-in, the tube length won't line up and you'd need the matching rough-in version instead.

This one flushes at 1.6 gpf / 6.0 Lpf. If your facility standard or a water-conservation spec calls for 1.28 gpf, this valve won't meet it. Also worth confirming the bowl itself is rated for 1.6 gallons, since pairing a 1.6 valve to a bowl engineered for a lower volume can cause carry problems.

Battery powered. Four C-size alkaline batteries are included in the box, so there is no transformer, no hardwiring, and no electrician needed to put it in service. That's the practical reason facilities pick this over a hardwired sensor valve in an existing restroom where there's no power at the stall.

There is an override button on the valve, but it's electronically operated, so it drives the same solenoid the sensor does. It covers a missed sensor read or a user who wants to flush on demand. It is not a mechanical backup for dead batteries, so battery replacement stays on the PM schedule.

This is a diaphragm-type valve, which is the common commercial choice and generally more tolerant of the lower supply pressures found in many buildings. Piston valves are often favored where water quality is poor and grit is the main failure mode. On the diaphragm side, this one uses EvoLast material formulated to resist chlorine and chloramine, which is what usually hardens and cracks a standard diaphragm early in municipal water.

Run-on is usually a plugged refill orifice in the diaphragm. This valve uses DynaClean, an integral wiper spring that scrubs that orifice on every flush, so debris doesn't build up and hold the valve open. It's the main maintenance argument for this model in a building where you're replacing diaphragms often.

No. It's a commercial flushometer, and flushometers need the supply volume a commercial building provides; typical residential piping won't deliver it. It also only works with flushometer-style bowls carrying a 1-1/2 inch exposed top spud, not a standard tank-type residential toilet.

The body is a proprietary brass alloy chosen to resist dezincification, which is the failure where zinc leaches out of brass and leaves a porous, crumbling casting. That matters most in buildings with soft or chloride-heavy water where standard brass flushometers pit out early.

Shipping specs list it at 11.25 x 11.25 x 10.125 inches and 8.408 pounds. Useful if you're laying out a partition-to-wall clearance or staging a pallet of valves for a multi-stall retrofit.