Usage Tips:Comprehensive Kit Components: This R12 to R134A conversion kit includes 1 x 90 low side and 1 x 90 high side retrofit adapters, along with low and high pressure side AC fitting port retrofit adapters, each equipped with a dust cap. Additionally, it comes with 2 x valve core removal tools for easy installation. Construction: Crafted from high-quality brass and aluminium alloy, the adapters in this kit offer excellent sealing and heat resistance. Their sturdy build ensures they are not prone to rust, and their leak-proof design guarantees reliable performance. Universal Compatibility: Designed to fit 1/4inch female to 7/16inch-20 UNF connections, this kit accepts R134A quick disconnect hoses, making it a versatile solution for various AC systems. Optimal Size for Easy Use: The low side adapter (blue cap) measures 1/4inch (7/16inch-20) x 13 mm, and the high side adapter (red cap) is 1/4inch (7/16inch-20) x 16 mm. These dimensions a hassle-free installation, saving time and effort. Versatile Application: The kit includes two 90 and two straight type AC fitting port retrofit adapters, suitable for most AC air conditioner refrigerant systems. The included valve core removal tools simplify the maintenance and repair processes. Colour:As Shown Material:Metal Package Contents: 1 set * Air conditioning conversion adapter kit Only the above package content, other products are not included. Note: Light reflection 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.