Condition: 100% Brand New Item Type: CO2 Cylinder Adapter Material: Aluminum Alloy Weight: Approx. 83g / 2.9oz Thread: Female Thread TR21-4 Male Thread W21.8-14 Length: Approx. 3.6cm / 1.4in 1Good sealing performance, no gas leakage when connected to the cylinder, can be used for a long time. 2You can fill carbon dioxide from larger bulk cylinders into smaller soda cylinders. 3This adapter is made of high-quality aluminum alloy, high-pressure resistant, with good durability and stability. 4The thread is tight, the installation and use method is simple, and the practicability is strong. 5With exquisite technology and stable inflation, it is an ideal choice for aquarium, home brewing and soda water.1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.1 x CO2 Cylinder Adapter1 x Gasket