WIDE COMPATIBILITY - Charging port adapter R12 R22 Port to accept R134a Quick Disconnect. These Low/High side retrofits/adapters/fittings will convert your old 1/4 inch or 7/16 inch- 20UNF R12 R22 charging port and accept the R134a quick disconnect hose. PREMIUM - With solid copper material, resistant to corrosion & good extensibility. EASY INSTALLATION: The low AC fitting conversion adapter with time-saving and effort-saving while installing, lightweight, shortcut. DIMENSION - Low Side, 1/4 inch (7/16 inch- 20) x 13 mm, blue. High Side, 1/4 inch (7/16 inch- 20) x 16 mm. Colour:gold Material:brass Package Contents: 1 * low-pressure Quick Coupler 1 * high-pressure quick coupler 1 * 13 mm Blue Cap 1 * 16 mm Red Cap Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.