Features: Color: Silver Inner Thread: TR21-4 Outer Thread: W21.8-14 1. Easy to use this adapter to fill Co2 to Stream tank. 2. Integrated pressure gauge for safety. 3. Adjustable valve pin ensures compatibility with any cylinder valve variation. 4. Advanced adapter design means no more leaks while attaching the adapter to the cylinder. 5. The male/output thread on the adapter is made to DIN477 / JIS m22-14 / W21.8-14 / .860"x1/14 (covers UK, Europe and Asia) specifications, which will fit industry standard regulators. Instrustions: 1. Attach your regulator to the adapter using an appropriate wrench or spanner. 2. Holding the cylinder firmly with hand, tighten the adapter/regulator to the cylinder using a wrench or spanner. 3. The pin inside the adapter will depress the valve on the cylinder to open the flow of gas. 4. Continue to tighten the adapter to the cylinder until the cylinder slips in your hand. Package Contents: 1 * Adapter