Features: Made of premium metal material, which ensures the maximum durability. Professional manufacturing, high accuracy and not easy to break, anti-corrosion and wear resistance. Easy to screw empty CO2 cylinder into the adapter. Small size and lightweight, easy to use and store. Have one 1/8npt threaded port. Fits for 21*4 CO2 tank thread. Specification: Condition: 100% Brand New Item Type: CO2 Refill Adapter Material: Metal Color: Black Size: Approx. 3cm/1.2in Weight: Approx. 68g/2.4oz Package List: 1 x CO2 Refill Adapter Note: 1. Because there was a manual measuring ,the size may has 1-2inch difference. 2. The color may be slight different due to the condition or light or different monitor. 1Have one 1/8npt threaded port. Fits for 21*4 CO2 tank thread. 2Small size and lightweight, easy to use and store. 3Easy to screw empty CO2 cylinder into the adapter. 4Professional manufacturing, high accuracy and not easy to break, anti-corrosion and wear resistance. 5Made of premium metal material, which ensures the maximum durability.