The SÜA SMP400 is a Heavy-Duty Nitrogen regulator designed for purging, pressure build-up and leakage tests in air conditioning and refrigeration systems. It is also widely used for the charge and recharge of nitrogen in shock absorbers as well as other industrial and scientific applications where a controlled pressure of inert gas is needed. The Inner connector is a CGA-580 that fits all standard Nitrogen, Argon, and Helium American tanks. The outlet connector is a 1/4" Flare that fits HVAC Charging Hoses for Purging and Pressure Testing and high-pressure lines. This regulator comes equipped with two - 2" gauges with rubber protectors. Delivery Pressure: 20-600 psi - Maximum Inlet Pressure: 3,000 psi Low pressure Gauge Range: 0 - 800 psi High pressure Gauge Range: 0 - 4,000 psi Available Options: Regulator Only and Regulator with Refrigeration Hose, (60 inches Long, 800 PSI Max Pressure and 1/4" Female Flare Connections)