• Contacts: N.C. SPDT • Factory set to: On @ 80 PSI - Off @ 100 PSI • 1/4" FPT Input port • Model(s) This Part Fits: AirStar® 1, AirStar® 2-1, AirStar® 2-2, AirStar® 3, AirStar® 5, AirStar® 7, AirStar®10, AirStar®10C, AirStar®21, AirStar®21C, AirStar®22, AirStar®22C, AirStar®30, AirStar®30C, AirStar®50, AirStar®50C, AirStar®70