Used to search for underground natural gas leaks, BHP-375-G features self-cleaning venturi vacuum pump and integrated silencer atop 42 in. standpipe. Unit operates on 80 psi compressed air, runs at 85 dB, pulls 28 in. Hg vacuum, and has evacuation capacity of 28 ft³/min. Construction elements include twist claw coupling to ½ in. air line, ¼ turn ball valve, and stainless steel vacuum gauge with 2 in. dial face.