Restek, 20668580, Automatic Switchover System with Line Regulator for Use with N2, He, Ar, CGA 580, Brass

Switching pressure: 200 psig/170 psig (1379/1172 kPa) Inlet connections: flexible SS pigtails (36") Line regulator: 0 to 150 psig (0–1034 kPa)
Features & Benefits
High-purity automatic switchover systems provide a continuous supply of high-purity gas to the laboratory, process, or instrument to allow you to replace a depleted gas source without interruption in the gas supply. Continuous gas supply is achieved by setting the two regulators at slightly different pressures and discharging one side of the system at a time. These models include flexible, all-stainless-steel pigtails with armor casing. The CGA connection on each pigtail has a check valve in the gland to prevent contamination and minimize purging requirements.