... interchangeable expansion valve 1.For R22,R134A,R407A,R507/404A 2. easy to change driving head and valve disc 3.MOP interchangeable expansion valve Characteristics ... connecting bolts, it is easy to change driving head and valve disc.l Stable superheat setting.l Can be supplied with ... anticlockwise one round,reduces superheat 0.3°C. interchangeable expansion valve, for R22,R134A,R407A,R507/404A(TCL/TRF)