American Standard Ultima Selectronic Exposed Toilet Flush Valve, Diaphragm Type, Base Model, 1.6 gpf/6.0 Lpf - AMS-624B161

Toilets. The Ultima Selectronic 624B161 is a toilet flush valve rated 1.6 gpf / 6.0 Lpf, which is the standard water closet flush volume. Urinals run much lower volumes, so don't use this on a urinal fixture.

No. The Ultima Selectronic 624B161 is a diaphragm-type flushometer for flushometer-valve (tankless) water closets fed by a supply line sized for a flush valve. A gravity tank toilet uses a tank flush valve and fill valve instead, not a flushometer.

Sensor operated. Selectronic is American Standard's electronic no-touch actuation line, so the valve flushes automatically when the user steps away rather than by a manual lever. That is what makes it a common pick for high-traffic restrooms in schools, airports, and healthcare where hands-free is specified.

Exposed. The valve body, control stop, and vacuum breaker mount on the finished wall side in chrome, so no access panel or in-wall chase is required. If the spec on the drawing calls for a concealed valve behind a wall plate, this is the wrong configuration.

The 624B161 is a 1.6 gpf / 6.0 Lpf valve. Pair it with a water closet rated for 1.6 gpf. If your fixture is a 1.28 gpf HET bowl, use a flushometer matched to that volume instead, since a 1.6 valve on a 1.28 bowl oversupplies the flush.

Base Model is the entry configuration of the Selectronic diaphragm flushometer, meaning it ships without the added options found on higher trim levels of the same family. Ordering-wise, the part number to quote is 624B161.002 in chrome.

Commercial. It is catalogued in American Standard's commercial line, and a diaphragm flushometer is the type specified for high-frequency use in office buildings, schools, and public restrooms. For a single-family home with tank toilets it is not applicable.

This one is diaphragm type. Diaphragm flushometers are the more widely specified commercial choice and their rebuild kits are the ones most maintenance carts already stock. Piston valves are chosen where water quality is poor or line pressure swings, since a piston tolerates debris better. If the other stalls in your building already run diaphragm valves, staying diaphragm keeps one repair kit on the shelf.

Chrome, as MPN 624B161.002. That is the only finish offered on this model, and it matches the polished chrome trim used on most commercial restroom flushometers and supply stops, so it blends with existing fleets in a multi-stall room.