Anti-Siphon Vacuum Breaker Size 1/2 in Connection Type NPT Material of Construction Lead Free Brass Seal Silicone Max Pressure 125 psi Temp Range 33 Degrees to 180 Degrees F Height 2 3/4 in Width 2 in Standards ANSI A112.1.1 ASSE 1001 CSA B64 Compliance ANSI A112.1.1 ASSE 1001 CSA B64 Lead Free