You can also remove the disc without special tools and without dismantling the valve

MOUNTING BOX 115V

Water Surface Area: 10-1/8 in x 8-5/8 in

Brand and Series: American Standard Cadet(R)

Securely welded to the post

Misty Dust Mop Treatment, Attracts Dirt, Non-Oily, Grapefruit Scent, 1Gal, 4/Carton - AMR1003411 Nominal Size-30" X 18" X 1.5" You can also remove theDressing for dust mop heads aids in the removal of dust, dirt, and other abrasive matter from floor surfaces Mop heads treated with this compound act as a dust magnet Attracts and holds particles until mop is cleaned or laundered Non oily and leaves a dry, protective, plasticized film on floor For wood, asphalt, linoleum, vinyl, vinyl composition, rubber, terrazzo, concrete and gymnasium floors Treatment will not harm waxed or finished surfaces Floors