American Standard Ultima Diaphragm Assembly for Toilet Flush Valve 1.28 GPF - AMS-M954322

It is the 1.28 GPF version, matching a high-efficiency water closet. The flush volume on a diaphragm flushometer is set by the diaphragm kit itself, so putting a 1.28 kit into a valve changes that valve's delivered volume. If the fixture on the wall is a 1.6 GPF bowl, order the kit that matches the bowl rating instead.

It is the internal rebuild kit only, a diaphragm and seal assembly that drops into an existing flushometer body. The valve body, control stop, vacuum breaker and handle stay on the wall. If the chrome body itself is damaged or leaking at the stop, a rebuild kit will not fix it and you need a complete flush valve.

The kit comes complete with the closet or urinal mechanism, so you get the working internals in one package rather than sourcing a relief valve, guide and disc separately. Plan on shutting the control stop, pulling the outer cover, and swapping the assembly as a unit.

The diaphragm is a chemical and clog resistant design, which is the failure mode that takes flushometers out of service in schools, stadiums and other heavy-use restrooms: grit lodging in the bypass or cleaner attacking the rubber. For a facility standardizing rebuild parts across many valves, it is a single part number that covers Sloan and Zurn diaphragm bodies as well as American Standard Ultima.

The manufacturer part number is M954322-0070A from American Standard. It ships as a single configuration with no finish option, since the parts sit inside the valve body under the cover.