Air Gap For Use With Watts 909 (M1 or 8 in to 10 in) Watts Series 909 (4 in to 6 in) Size 3 in Connection Type NPT Length 9 5/8 in Width 6 3/8 in Material of Construction Cast Iron Max Pressure 175 psi Temp Range 33 Degrees to 180 Degrees F Standards FCCCHR USC