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 53377-YF R1234yf 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 53377-YF Sight Glass allows users to visually inspect the refrigerant in any R1234yf 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.