A-220-413-AI Low Pressure Cut-Out SwitchOne New Aftermarket Replacement Low Pressure Cut Out Switch for White, Allis Chalmers, and International Farmall Tractors and Sprayers This air conditioning low pressure cut out switch mounts on the receiver drier and protects the A C compressor by cutting out the system when refrigerant pressure drops below a safe threshold. It is a normally open (N. O.) switch that closes at approximately 35 PSI and opens at approximately 25 PSI. Compatible with R12