Install this Trinary Safety Switch Kit anywhere in your #6 STANDARD BARRIER HOSE. Does not work with Reduced Barrier or E-Z Clip hose. Features include low pressure and high pressure compressor clutch cutoff functions as well as electric fan engagement. 30 PSI low pressure cutoff. 406 PSI high pressure cut off, and 254 PSI fan engagement. This switch is intended for aftermarket A/C systems such as Vintage Air.