Boxes mount securely to stud. Separates supply and drainage systems into 2 stud bays. Sepatate boxes offer flexible layout. Durable ABS stands up to job site abuse. Drain knockout is easy to remove with plyers. Debris covers included to protect boxes from drywall mud and paint. High quality quarter turn ball valves. 3/4" Male hose thread outlet connections. 1/2" PEX F1807.