Boxes mount securely to stud. Separates supply and drainage systems into 2 stud bays. Separate boxes offer flexible layout. Durable ABS stands up to job site abuse. Drain knockout is easy-to-remove with pliers. 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" Female sweat.