Cash Acme Non-Potable 3/4" V3 Hose Bib Vacuum Breaker w/Lock Screw

Prevents dangerous back-siphonage and backflow into a non-potable water supply. All-brass construction with threaded connections, neoprene seat disc, rubber washer, and steel set screw. The V-3 is equipped with a protruding tip device for manual draining of faucet (after hose removal), which prevents freezing. Maximum pressure is 125 psi; maximum temperature is 180°F (82°C). 

For use around homes, schools, commercial buildings, laboratories, or any place involving removable hoses attached to threaded faucets, indoors or out.