Nitrogen / Inert Gas Regulator 0-400 PSIG - HVAC Purging - Inertization 1/4" Male Flare Outlet Connection, Fits HVAC Charging Hoses for Purging and Pressure Testing Solid brass, full size regulator - 2 Gauges with rubber protectors. Delivery Pressure Range: 20-400 psi - For its use with inert gases like Nitrogen, Argon and Helium HVAC Purging / Inertization / Pressure Tests / Leakage Tests CGA-580 Inlet Connector, Fits all Nitrogen, Argon, Helium, and Inert Tanks.