Refrigerants: HCFC and Non-flammable HFC refrigerants. Regulating range 0 - 6.0 bar (0 – 87 psig), factory setting 0.4 bar (5.8 psig), max. working pressure 28 bar (406 psig). Max. test pressure 31 bar (450 psig). Access port: ¼ in. Schrader valve for pressure testing.