Taprite Dual Gauge Nitrogen Regulator for CGA 580 Valve Use this regulator on any High Pressure Tank with a CGA-580 valve. Nitrogen tanks have a female thread (CGA-580), these regulators have a male thread. Double Gauge Regulators Measure PSI, as well as the Volume of Nitrogen in the Cylinder. This regulator has a duck-bill check valve which prevents back flow of liquid into the regulator. 1P1P, CGA580 Inlet, 5/16" Barb Shutoff w/Duckbill Check, 60lb and 3000lb gauges.