Dimensions: Low side, 1/4"SAE (7/16'-20) x 13 mm, blue. High side, 1/4" SAE (7/16'-20) x 16 mm, red Material: Quick coupler adapter uses solid copper material, corrosion resistance and good scalability Extensive compatibility: charging port adapter R12 R22 port accepts R134a quick disconnect Conversion: These low and high side retrofit adapters will convert your old 1/4" SAE or 7/16"-20UNF R12 R22 charging port and make it accept the R134a quick disconnect hose Convenient installation: low AC adapter conversion adapter, installation time-saving, labor-saving, light weight, fast Quick coupler adapter is made of solid copper. The high-low coupler with extended disconnect protection sleeve meets the durability. The charging port adapter R12 R22 port accepts R134a quick disconnection. It converts your old 1/4" SAE or 7/16"-20UNF R12 R22 charging port. color: as show Size: Low side: 1/4"SAE (7/16"-20) x 13 mm. High side: 1/4" SAE (7/16"-20) x 16 mm. Note: Manual measurement, please allow slight errors on size. The colors may exist slight difference due to different screens. Package Including 1 Pair * Quick coupler adapter