Features: The quick coupler is made of brass metal material, which is strong and durable, with high strength, rust resistant, not easy to break, and can be used-for a long-time. The quick coupler has an auto-off function, making it easier to remove and install. The-ball lock-design combined with the rubber seal provides excellent sealing performance. This low and high-side quick coupler is suitable for car air conditioner AC-charging, R1234yf refrigerant, AC-manifold pressure-gauge, diagnostic check, recovery, and evacuation-work. It is made of good quality aluminum-alloy, durable to use. Connector features with stable performance and easy operation. Specifications: Material:Alloy+Copper Size:Approx.2x7cm/0.79x2.76inch Takeover-Caliber: QC14L AD50 QC15L AD50 QC14H L AD51 52 QC14 AD51 Package Includes: 2x Quick Coupler note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.