[ material] It has good air tightness, 3000PSI working pressure, strong, safe and reliable. [Easy to use] The supplementary adapter is equipped with a pressure gauge, which can clearly know the pressure, making it safer to use. Equipped with two on-off valves (for filling and ventilation), easy to use [Application] The replenishing adapter can be used to replenish a small carbon dioxide oil tank from a larger carbon dioxide oil tank. The replenishing adaptor is American CGA-320 (G1/2). Please ensure that the thread type of the carbon dioxide oil tank is the same. [Caution] If the top vial is very thick and short and cannot be inflated, the hose will expand. Please replace the thin top vial. The atmospheric cylinder should have sufficient pressure. If there is no siphon or liquid carbon dioxide in the cylinder, the carbon dioxide atmospheric cylinder needs to be inverted for inflation.<br><br>Material:metal colour:Silver+gold<br><br>Package Contents: 1 x CO2 Refill Adapter with Hose 3 x fittings(Note: Random color, don't accept the specified color.)<br><br>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.