Pricing mentioned is for EA. Requires a minimum buy of 1 piece. M1 Series Preset Pressure Gauge Regulators, Oxygen, CGA540 Nut/Nipple, 3,000 psi; Hazmat=False; Features=1100 SCFH air maximum rated flow at 2000 psi;Chrome-plated brass body with all brass high-pressure chamber;DISS gas specific outlets;Internal reseating relief valve protects against overpressurization;Chrome-plated brass body with all brass high-pressure chamber;Internal reseating relief valve protects against overpressurization; TestingAndApprovals=Tested to CGA Standards which include ignition testing;UL listed; StandardPack=1EA; CountryOfOrigin=US; Diaphragm Material=Neoprene; Filter Material=Sintered; Flow Range=0 - 100; Gas Type=Oxygen; Gauge Size=2 in; Inlet Connection=CGA-540 Nut and Nipple; Inlet Pressure=3000 psi [Max]; Length=6.200 in; Outlet Pressure=50.0 psi, 50.0 psi [Max];