These Low or High side retrofits will convert your old 1 or 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 or 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 and Alloy Retrofit Length: 28mm or 1.1in (approx) Blue Cap Diameter: 18mm or 0.71in (approx) Red Cap Diameter: 20mm or 0.79in (approx) Package Size: 100 x 80 x 30mm or 3.94 x 3.15 x 1.18in Package Weight: 71g or 2.5ounces Note: 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 x 7 or 1620UNF (1 or 4") R12 or R134a Low Side Retrofit 1 x 7 or 1620UNF (1 or 4") R12 or R134a High Side Retrofit 1 x Blue A or C System Cap 1 x Red A or C System Cap 2 x Removable Valves