Campbell Air Volume Control, AV45

Brady nonrepairable style. Zinc-plated steel construction, buna-n diaphragm and air valve. Brass spring and orfice (model No. AV45). Built-in ball check valve (model No. AV100). Temperature maximum 140 deg., pressure maximum 150 P.S.I. No. AV45: Temperature Rating: 140 deg F, Pressure Rating: 150 psi, Material: Zinc Plated Steel No. AV100: Temperature Rating: 140 deg F, Pressure Rating: 150 psi, Material: Zinc Plated Steel