American Standard Solenoid and Piston Assembly - Toilet FV - AMS-M970693

It's the electrically actuated heart of the flush valve. The solenoid is the part the sensor signals when a user steps away, and the piston is the part that opens and reseats to meter the flush. When a piston-type Selectronic toilet valve fires but won't flush, flushes continuously, or won't respond to the sensor at all, this assembly is the usual replacement. It ships as a matched solenoid and piston together, so you're not sourcing the two pieces separately.

Often, yes on a piston-type Ultima Selectronic. A piston that no longer reseats cleanly runs on; a solenoid that isn't holding its position causes erratic or repeat flushes. Because the M970693 comes as a solenoid and piston together, replacing it takes both suspects out at once rather than swapping one and coming back for the other. Continuous running that persists after the assembly is replaced points at the supply stop or the sensor electronics rather than the valve internals.

Pull the valve cover and look at the moving element. A piston valve uses a cylindrical plunger that rides up and down in a bore; a diaphragm valve uses a flat flexible rubber disc clamped across the body. The M970693 assembly is the piston-type part, so if you find a diaphragm, order the diaphragm-side repair part for that valve instead. On a facility with mixed vintages, it's worth opening one of each before placing a bulk order.

The manufacturer part number is M970693-0070A, an American Standard genuine service part. That's the number to put on a purchase order or hand to a plumber. It's a single-configuration item, so there's no finish, size, or handing to specify with it.

The kit covers the solenoid and the piston, which is the working set inside a piston-type Ultima Selectronic toilet valve. It does not include the sensor module, the transformer or battery pack, the control stop, or the vacuum breaker, so a job traced to any of those needs its own part. Standard practice on a restroom service call is to close the supply stop before opening the valve and to keep a spare assembly on the truck when you're maintaining a bank of sensor toilets.

It's a sensible shelf item anywhere you run piston-type Ultima Selectronic toilet valves across multiple fixtures. The solenoid and piston are the wear items in an electronic flushometer, and standardizing on one assembly across a building means one part number covers every one of those valves instead of a per-fixture guess at service time. Facilities running a mix of piston and diaphragm Selectronic valves should audit which is on each fixture first, since this assembly only serves the piston valves.