The 12-00663-75 Carrier APX Switch Guard is a precision-fit replacement for OEM guard 76-00908-50, designed to protect the Carrier APX Display Module Controller from accidental shutoff. No dealer required. The locking screw design spans across the ON/OFF switch face, preventing unintended activation from vibration, contact, or cab activity, keeping your refrigeration unit running without interruption. A simple, low-cost addition that prevents costly temperature excursions from accidental shutoffs. Compatible with any truck make pulling a reefer with the Carrier APX system. Maintaining a Kenworth or Peterbilt? We also stock the A13-1016 flange bushing for PACCAR platforms, and our full parts catalog covers cab fairings, mounting hardware, and more. COMPATIBILITY CHART Series Models X4 Series 7500 · 7300 · 6500 X3 Series 2500 X2 Series 2100 · 2500 Vector Series 8500 · 8600 · 8610MT Compatible with any truck make pulling a reefer with the Carrier APX system.