The Airsept Click Lock A/C Security System is a unique new tool that alerts service providers if an air conditioning system has been opened since the repair shop last serviced the system. The Click Lock tamper-proof cap features a one-piece heat-resistant plastic housing that snaps closed around an A/C service fitting. Once closed, Click Lock cannot be opened without visibly damaging the cap. It fits over standard High or Low Side service fittings. The locking mechanism snaps together by hand. Each Click Lock tool is labeled with a unique serial number. This allows easy repair order tracking.