American Standard Ultima Manual Valve Only for Retrofit, Piston-Type, 0.5 gpf/1.9 Lpf - AMS-6045505

It's the valve body only. The stop valve, inlet assembly, spud coupling and vacuum breaker tube are not included, so you either reuse the existing ones on the fixture or order them separately. That's what makes it a retrofit part: it drops onto an opening that already has the supply stop and spud hardware in place. Order the MPN 6045505.002 in chrome.

Toilet only. The Ultima 6045505 is a water closet flush valve rated at 0.5 gpf / 1.9 Lpf. Urinals use a different flush volume and a different valve; don't substitute this one on a urinal fixture.

Only if the bowl is engineered for 0.5 gpf. This valve delivers 0.5 gpf / 1.9 Lpf and there is no external volume adjustment, so you cannot dial it up to suit a 1.6 gpf or 1.28 gpf bowl. Putting it on a bowl designed for a higher volume will give you poor bowl clearing. Confirm the gpf stamped on the fixture before you swap.

The handle is described as an ADA-compliant non-hold-open type, and it shuts the valve off automatically after each flush rather than relying on the user to hold or release it. That matters on accessible stalls in schools, healthcare and government facilities where the flush control has to be operable without tight grasping or sustained force.

No handing to specify. The same valve installs left- or right-handed, so one part number covers both orientations of the supply. For a property manager standardizing a restroom group, that means fewer SKUs to stock across openings where the stop comes in from either side.

Run-on is usually a refill orifice fouled by grit or scale. The Ultima uses DynaClean, an integral wiper spring that scrubs the refill orifice on every flush specifically to prevent valve run-on. In hard-water or high-traffic restrooms that's the failure mode this design targets.

The Ultima 6045505 is piston operated, which the manufacturer ties to flush accuracy and repeatability, flush after flush. That consistency is the reason piston valves get specified on low-volume 0.5 gpf bowls, where a small variation in volume shows up as a bowl that doesn't clear. Diaphragm valves are the other common choice and are more widely stocked for rebuild kits, so if your maintenance crew already carries diaphragm kits for the rest of the building, mixing in a piston valve means carrying a second repair part.

No. There is no external volume adjustment on this valve, so what you install is the flush volume you get. If your maintenance staff expects to tune volume at the valve, this isn't the model for it.

Chrome, single option, ordered as 6045505.002. That matches the standard polished chrome exposed flushometer trim in most commercial restrooms, so a single-valve replacement won't stand out from the others on the line.