American Standard Ultima Touchless Sensor Toilet Flush Valve, Diaphragm-Type, 1.1 gpf/4.2 Lpf - AMS-6147SM111

The Ultima sensor valve is built to an 11-1/2 inch (292 mm) rough-in, measured from the supply stop centerline to the bowl spud. If your existing supply comes out at a different dimension, you will need an offset or a different rough-in valve.

Batteries. Four C-sized alkaline batteries ship with the valve, so there is no transformer, no junction box, and no conduit to pull. That is what makes it practical as a one-for-one retrofit in an occupied restroom where no one wants to open a wall for low-voltage wiring.

The valve flushes at 1.1 gpf / 4.2 Lpf, which is a high-efficiency rate. It only performs properly on a bowl engineered for that volume. If your fixtures are older 3.5 gpf or 1.6 gpf flushometer bowls, pairing them with a 1.1 gpf valve commonly causes carry problems and double flushing, so match the valve rate to the bowl rating stamped on the china.

There is an electronically operated override button on the valve, so a user or a janitor can trigger a flush by hand without waiting for the sensor to pick them up. Useful in facilities where staff want to verify the bowl cleared after service.

Diaphragm type. The diaphragm uses American Standard's EvoLast material, which is made to resist chlorine and chloramine so it does not deteriorate early in municipal water treated with those chemicals. Piston valves behave differently on dirty or hard water; if your building has a history of chewing through diaphragms, the chloramine-resistant material is the reason to look at this one.

That is what the DynaClean wiper spring is for. An integral wiper spring scrubs the refill orifice on every flush, which is the orifice that clogs with grit and scale and causes valve run-on. It is a self-cleaning feature, not something maintenance has to service.

Chrome, ordered as part number 6147SM111.002. It is the only finish this model is built in, so if a facility is standardizing on brushed nickel or matte black trim, this valve will not match.

Commercial. It is a flushometer valve for exposed top-spud bowls, the configuration used in schools, airports, healthcare, and office restrooms, and the body uses a proprietary brass alloy that resists dezincification for long service on municipal supply.

It weighs 8.408 lb and the stated envelope is 11.25 x 11.25 x 10.125 inches. Worth checking against partition clearance in tight stalls and against your shipping allowances if you are ordering a pallet of them for a fixture-wide changeout.