Brass vacuum breaker that prevents water backflow from entering the home through an outside hose bibb. Self-actuating, with no manual operation needed. 3/4 in. hose thread outlet complies with ANSI B1.20.7. Break-off screw allows a permanent connection to the valve. 125 psi maximum working pressure, 34 to 160 F. NSF 61 compliant, ASSE 1011 and CSA B64.2. For nonfreezing areas. 1-year limited warranty.