interchangeable expansion valve 1.For R22,R134A,R407A,R507/404A 2. easy to change ... . Construct is simple and easy repairing. After turn off connecting bolts, it is easy to change driving head ... type and size according to customers requirement.l Suitable for R22, R134a, R407C, R507/404A.l If you have special ... superheat 0.3°C. interchangeable expansion valve, for R22,R134A,R407A,R507/404A(TCL/TRF)