Features 1、Made of high‑quality brass material to provide good durability and stability. 2、The carbon dioxide cylinder refilling adapter is stable in inflation and easy to install. 3、With pressure relief valve and 1500PSI pressure gauge, it is simple to use, safe and reliable. 4、The thread Specification is W21.8‑14 // TR21‑4, with good sealing performance and no gas leakage. 5、One end of this adapter is soda wire, and the other end is external thread quick disconnect adapter. Specifications Item Type: CO2 Refill Adapter Material: Brass Color: Yellow and Black Thread Size: W21.8-14 // TR21-4 Weight: Approx. 345g / 12.2oz Total Length: Approx. 15.5cm / 6.1in Applicable Countries: South Korea, Japan, Britain, Germany, France, Poland, Norway, Switzerland, Russia, Ukraine, South Africa, Sweden, Chile, Czech Republic, Singapore. (Some countries are also called DIN477 /JIS m22-14) How it Works: 1. Screw the adapter onto the CO2 gas cylinder 2. Screw the empty CO2 bottle into the on/off recharge adapter 3. Open the valve of the large cylinder bottle 4. After 15-20 seconds, the cylinder is completely filled 5. Close the large cylinder bottle valve 6. Open the exhaust valve screw to discharge residual gas, unscrew the screw of the carbon dioxide container, and finish. Package List 1 x Adapter 2 x White Gasket 1 x Transparent Gasket