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