Features and Benefits: 100 Viscosity PAG Oil for R134a systems Utilizes the award-winning Spot-gun injection system Allows you to inject a precise amount of dye into a pressurized system via the low side service port Eliminates moisture from entering the system From the recognized leader in UV leak detectionUview designs and manufactures and delivers the most innovative and functional products to the automotive repair industry. This convenient 8 oz. cartridge utilizes the award-winning spot-gun injection system. Also has the ability to inject a precise amount of oil into a pressurized system via the low side service port. This helps to eliminates contaminates from entering the system. It's simple to use, with its one step process! Today’s vehicles require precise amounts of oil and specific viscosities, OEM’s have deemed it essential, shouldn’t you?