piston compressor 1.suitable for refrigerants R134a,R404A,R407c,and R22, ... compres 3.high quality high effeciency Beifeng semi-hermetic compressor is suitable for refrigerants,such as R134a,R404A,R407c, ... , such as 134a.R404A.R407C.R22.The same model compressor is suitabke for different temperatures.Excellent functions: Motor highly ... heater is fitted to prevent liquid migtation. YISHI compressor