These Low/High side retrofits will convert your old 1/4" R12 charging port and allows you to connect the R134a hose.Features:Made from superior material, has great durability.Good choice for car accessory replacement.Convert your old 1/4" R12 charging port and allows you to connect the R134a hose.Come with removable Schrader valves.Save time and effort, light weigh and easy installation.Specifications:Material: ABS + AlloyRetrofit Length: 28mm / 1.1in (approx)Blue Cap Diameter: 18mm / 0.71in (approx)Red Cap Diameter: 20mm / 0.79in (approx)Package Size: 100 * 80 * 30mm / 3.94 * 3.15 * 1.18inPackage Weight: 71g / 2.5ouncesNote: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.Package List:1 * 7/1620UNF (1/4") R12/R134a Low Side Retrofit1 * 7/1620UNF (1/4") R12/R134a High Side Retrofit1 * Blue A/C System Cap1 * Red A/C System Cap2 * Removable Valves