The G1/2-14 CO2 Cylinder Fill Adapter is made of brass material, and safe. The of the CO2 refueling adapter is polished, with good sealing performance, anti-oxidation and anti-rust. The thread design is , the workmanship is exquisite, the performance is stable, and the service life is long. Good sealing performance: The M18x1.5 CO2 tank adapter has good sealing performance and not leak when connected to the gas cylinder. EASY INSTALLATION: In just a few simple steps, your CO2 cylinder is ready to use this connector. Thread: G1/2-14 to M18x1.5, 5/8-18UNF Height: 55.5mm Deflated to the safety plate width: 55.7mm Maximum pressure: 5000psi Material: brass colour: gold Package Contents: 1 x CO2 Tank Adapter 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.