American Standard Selectronic Commercial Toilet Flush valve Piston Assembly - AMS-M964551

It is the internal piston assembly for an American Standard Selectronic commercial toilet flush valve. The piston is the moving element that opens and closes the valve on each flush cycle, so this is the repair part you order when a Selectronic toilet flush valve runs on, fails to shut off, or will not deliver a full flush. Order it by manufacturer number M964551-0070A.

No. The M964551-0070A piston assembly is specified for toilet (water closet) service on American Standard Selectronic flush valves. Urinal flush valves move a much smaller volume per flush and use their own piston part, so ordering this one for a urinal gets you the wrong flush volume. Match the repair part to the fixture type the valve serves.

Yes, for a facility standardized on American Standard Selectronic toilet flush valves it is a sensible stock item. The piston is a wearing component in a sensor flush valve, and keeping M964551-0070A on the shelf means a maintenance tech rebuilds the valve on the first visit rather than taking the fixture out of service while a part ships. It is the same part across every Selectronic toilet valve that calls for it, so one line item covers the fleet.

There is nothing to choose. The piston assembly is sold as a single configuration with no finish option, because it lives inside the flush valve body where it is never seen. Finish only matters on the exposed valve cover and escutcheon, not on this internal part.