The TAOJUN Copper Sight Glass is a reliable visual monitoring component for refrigeration and air conditioning systems. Installed in the liquid line, it allows technicians to observe the refrigerant flow condition and check the system moisture level at a glance. The sight glass features a solid brass body, a clear circular glass window and a built-in WET/DRY moisture indicator, helping prevent moisture-related failures and prolonging the service life of the refrigeration system.