American Standard Ultima Manual Toilet Flush Valve, Piston-Type, 1.6 gpf/6.0 Lpf - AMS-6047161

The Ultima 6047161 manual flushometer is built for flushometer-style bowls with a 1-1/2 inch (38 mm) exposed top spud. If the bowl on the wall has a smaller spud or a concealed/back spud, this valve won't land on it. Check the spud collar on the china before ordering, since that is the one dimension that decides whether the valve mates up.

Rough-in is 11-1/2 inches (292 mm). That is the number to check against the existing supply stub if you're swapping a valve on an occupied restroom, because a wall stub set for a different rough-in means either a new penetration or an offset to make up the difference.

Yes, the 6047161 installs left- or right-handed, so the same part covers both an ADA stall where the handle has to be on the open side and a standard stall next to it. One SKU stocks for the whole restroom rather than carrying a left and a right.

The handle is an ADA-compliant non-hold-open type that shuts off automatically after every flush. The user doesn't have to hold it down for the bowl to clear, which is the part that matters for accessible stalls in a school, healthcare, or government facility.

It flushes at 1.6 gpf (6.0 Lpf), the standard water closet volume. Worth knowing before you order: there is no external volume adjustment on this valve, so you can't dial the flush down in the field. If a project calls for 1.28 gpf, this isn't the model to buy and then tune.

The Ultima 6047161 is piston operated, which American Standard specifies for flush accuracy and repeatability, flush after flush. Diaphragm valves are the other common style and are rebuilt with a diaphragm kit; piston valves are rebuilt with a piston kit, so the choice also decides what your maintenance crew stocks on the cart. If a building already runs piston valves, staying piston keeps one rebuild kit on the shelf instead of two.

Run-on usually traces to a refill orifice fouled by scale or grit. The Ultima uses DynaClean, an integral wiper spring that scrubs that orifice on every flush to keep it clear. It's the reason to pick this one for hard-water buildings where valves get called in for running constantly.

It has a high back pressure vacuum breaker built in, which also helps keep the valve from dripping between uses. That's the backflow protection a plumbing inspector looks for on an exposed flushometer, so you aren't adding a separate device to the assembly.

Manual, handle operated. There's no sensor, no batteries, and no transformer to feed. For a touchless restroom you'd need an automatic flushometer instead; for a facility standardizing on lever-operated valves that any tech can rebuild, this is the manual counterpart on the same 1-1/2 inch top spud bowl.

One configuration: polished chrome, manufacturer part number 6047161.002. That is the number to put on the PO or hand to a maintenance tech matching an existing bank of valves, since the chrome exposed valve is what's already on most commercial restroom walls.