1、5/16 inch barb, ball lock type, suitable for most soft drink PET bottles. 2、Made of food grade stainless steel, pressure resistance, wear resistance, corrosion resistance and durability. 3、Compact and portable, it can be quickly disconnected and easily connected, and it is more convenient to install without tools. 4、A detachable hex thread barb adapters that can connect the hose to the bottom of the bottle, making CO2 easier to combine with beer, better taste. 5、The sealing rings are all made of food grade silicone, there is no leakage at all. 2 x Carbonation Cap2 x Gasket Condition: 100% Brand NewItem Type: Carbonation CapMaterial: Stainless SteelColor: SilverSize: Approx. 6x 3.2x 3.2cm / 2.4x 1.3x 1.3in Weight: Approx.196g/ 6.9ozSpecification: 5/16in barb, ball lock type