Mastercool’s new nitrogen regulator is specifically designed to meet the specifications of HVAC/R and automotive A/C systems. This single stage nitrogen regulator is used to test systems for leaks when they do not contain refrigerant. Kits come with leak testing gauge and charging hose, high side coupler, packaged in a blow molded case. 53001 Nitrogen Pressure Regulator. CGA580 (US) Standard fitting. 1/4 FL-M outlet connection. 48 Yellow Charging Hose (47482). Leak Testing Adapter (53042). High Side Standard R134a 1/4 FL-M x 13mm Economy Coupler. Blow molded case (53000-PB). 1/4 SAE flare outlet port, with control valve, to keep pressure on the regulator at all times. T-Handle for ease of pressure adjustment. 63 mm (2 1/2) gauges with guards. High pressure gauge 4400 psig (300 bar). Low pressure gauge 1000 psig (70 bar).