interchangeable expansion valve 1.For R22,R134A,R407A,R507/404A 2. easy ... change driving head and valve disc.l Stable superheat setting.l Can be supplied with MOP(Max operating ... Suitable for R22, R134a, R407C, R507/404A.l If you have special requirement,please cantact STF.Superheat adjustingFactory setting: ... superheat 0.3°C. interchangeable expansion valve, for R22,R134A,R407A,R507/404A(TCL/TRF)