Look for an aluminum tag--or a silver or white adhesive label. The model number may be printed or stamped onto the tag and it may be written in two different type sizes or styles.
All Types
On Plate Around Inlet and Backwash Assembly.
On Drainpipe Under Valve On Plate on Back of Tank.
On Plate on Bottom Nest On Plate.
On Decal on Back of Top Cover.
