American Standard Selectronic Flush Valve Piston Assembly PWRX - AMS-M964946

The M964946 PWRX piston assembly is the service part for American Standard Ultima Selectronic urinal flush valves in the 6064, 6063 and 6062.601 series. If the valve on the wall is one of those three, this is the piston that goes in it. It is not a universal flush valve piston, so a Selectronic closet (water closet) valve or another manufacturer's diaphragm valve takes a different part.

On a Selectronic urinal valve, the piston assembly is the moving element that opens and closes the flush. When a 6064, 6063 or 6062.601 valve runs continuously, flushes weakly, or will not shut off, the piston is the standard rebuild part, and M964946 is the PWRX version of it. Sensor and solenoid faults present differently (no flush at all, or no sensor response), so confirm the valve is cycling before you replace the piston.

Order manufacturer part number M964946-0070A. That is the American Standard Selectronic PWRX piston assembly, and it ships as a single configuration, so there is no finish or trim option to specify on the order. Give the M964946 number to your parts desk along with the valve series (6064, 6063 or 6062.601) and you will get the right piston.

PWRX is American Standard's self-generating power system, and the M964946 piston is the PWRX version, matched to Ultima Selectronic urinal valves in the 6064, 6063 and 6062.601 series. Check the model number stamped on the valve body or cover against those three before ordering; a battery-powered Selectronic urinal valve outside those series uses its own piston.

One piston covers a lot of ground here: the M964946 PWRX assembly serves Ultima Selectronic urinal valves across the 6064, 6063 and 6062.601 series, so a facility standardized on those valves can carry a single piston on the shelf for all of them. Water closet Selectronic valves are a separate part, so a mixed restroom of urinals and closets needs two line items in the crib.

It is the internal piston assembly only, not a complete flush valve and not the sensor head. You get the piston that seats inside an existing Ultima Selectronic urinal valve body. If the valve body itself is damaged or the electronics have failed, the piston will not fix it.

No finish choice applies. The M964946 piston is an internal component that sits under the valve cover where nothing shows, so it ships in one configuration with no plated finish option. The exposed chrome you see stays on the valve body and cover you already have.