Oatey Quadtro washing machine outlet boxes can be used in commercial or residential applications which require supply valves and waste drain recessed into the wall. Available water hammer arrestor option provides water pressure shock arrestors required for installation on supply lines to quick closing valves. Fits PVC or ABS Sch. 40 DWV pipe.. Box dimensions: 8-3/4 in. W x 7-1/2 in. H x 3-5/8 in. D. 4 support brackets included for mounting. Faceplate dimensions: 11-3/4 in. W x 10-1/8 in. H. Top or bottom valve mount. Easy to remove knockout, Patent Pending Hammer Valves. Box made of high impact polystyrene. 2 in. drain opening fits PVC or ABS Schedule 40 DWV pipe. Box is not heat resistant. Snap-on faceplate frame accommodates up to 1 in. drywall