An Air Conditioner Sight Glass Indicator is located in the liquid line between the filter drier and the thermostatic expansion valve. This placement allows observation of the refrigerant after it has passed through the filter drier and before it reaches the thermostatic expansion valve, where it has a steady flow of liquid refrigerant.Attributes:• Shows liquid refrigerant flow and detects moisture presence• Allows for quick checks without needing to disconnect refrigerant linesApplications: An Air Conditioner Sight Glass Indicator is a transparent window installed in the refrigerant line of an air conditioner. It allows technicians to visually monitor the flow and condition of the refrigerant.