These Low/High side retrofits/adapters/fittings will convert your old 3/8 inch; or 7/16 inch; R12 charging port and accept the R134a quick disconnect hose. We continually strive for the of offering cheap top quality products and service to the customers of RT Technology . colour: blue+red Material: Metal plastic size: High: 3/8 inch Low: 7/16 inch Package Contents: 1*19 mm blue cap 1*22 mm red cap 1* low side quick connector 1* high side quick connector 2* Transparent connector cover Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.