A/C Solutions BMW R134a High-Pressure Cut Off Switch (green) (E30, E28, E24, etc.) (64531386971)The high pressure cut off switch is used to disengage the A C compressor when the system reaches maximum pressure. Unlike your original switch, this is specifically designed for R134a as the high pressure side operates at a higher PSI than that of R12. Whats included? R134a high pressure cut off switch Fitment notes: This switch is compatible with the E28 E24 filter drier and the early model E30 filter drier. For use with the following models: BMW