2" drain opening fits PVC or ABS Sch. 40 DWV pipe, Polystyrene box,• Easy to remove knockout, top or bottom valve mount, snap-on faceplate frame accommodates up to 1" drywall., 4 support brackets included for mounting. Dimensions: Box: 8-3/4"W x 7-1/2"H x3-5/8"D; Faceplate: 11-3/4" W x 10-1/8"H.