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.