The condition of the refrigerant in an A/C system is an important factor in the proper operation of all components and overall cooling efficiency. The only way to actually see the condition of the refrigerant in a vehicle's A/C system is with the use of the Mastercool 53376 R134a Visual Inspection Sight Glass. This unit can be used with a standard vacuum pump or with the vacuum function on a R/R/R machine. Easy to follow instructions will guide users through the use of either option.

The 53376 Sight Glass allows users to visually inspect the refrigerant in any R134a system and identify excess dye, oil or debris. Featuring a leak-free, ball-valve controlled design, the sight glass also enables users to extract a small portion of the refrigerant for actual visual inspection. The sight glass will allow the refrigerant extracted for the visual inspection to be deposited back into the system.