use in many kinds of refrigerants such as R22, R134A,R404,R407C. equipped with oil separator, high &lower pressure controller Usability: The compressor unit can for use in many kinds of refrigerants such as R22,R134a,R404,R407c.The same serial compressor unit,is suitable for different applications. Excellent functions: Equipped with oil separator,high and lower pressure controller,solenoid valve, ...