The T & S Brass Atmospher Vacuum breaker, 1/2 in. NPT inlet and outlet, atmospheric, polished chrome finish applicable for commercial kitchens, schools, hospitals, nursing homes, health care markets and residential markets. Atmospheric vacuum breaker with polished chrome plated brass body and 1/2 in. NPT female inlet and outlet. Certified to ASME A112.18.1/CSA B125.1, NSF 61-Section 9, NSF 372 and ASSE 1001.