Features: Good sealing performance, stable operation with no air leakage during connection, suitable for long-term use. Precision craftsmanship ensures safe and reliable performance, consistent inflation, and extended service life. Constructed from high-quality brass and aluminum materials for durability, wear resistance, corrosion resistance, and high-pressure tolerance. Features a female thread G1/2 to male TR21-4 thread connection for straightforward installation. Includes a dedicated inner hexagonal wrench for easy and practical assembly and disassembly. Specification: Condition: Item Type: CO2 Cylinder Adapter Material: Brass, Aluminum Thread: Female Thread G1/2, Male Thread TR21-4 Weight: Approx. 132g / 4.7oz Length: Approx. 4.3cm / 1.7in Wrench: Approx. 4.2x1.1cm / 1.7x0.4in Package List: 1 x CO2 Cylinder Adapter 1 x Inner Hexagonal Wrench Note: Please allow 0–1 inch error due to manual measurement. Monitors may display colors differently; actual product color may vary slightly from images. Please refer to the physical item as the standard.