Nitrogen Pressure Testing Regulator Kit 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. 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). 53001 Nitrogen Pressure Regulator. 48” Yellow Charging Hose (47482). Leak Testing Adapter (53042). Blow molded case (53000-PB) 53010