For use in R-134a and R-1234yf systems; Super concentrated dye detects leaks quickly, saving time and money; Added friction modifier and anti-wear additive improves efficiency and reduces wear; Antioxidant stops acid formation and prolongs oil life; Cartridge works exclusively with theSpotgun™ injection system; Unit Size:8 oz/240 ml; MaximumApplications:64 vehicles; Quantity: 1