Features: 1This ball lock carbonation cap is most used for homemade beverages carbonation and meanwhile it is great for cleaning beer/ soda/ water/ juice lines. 2High quality stainless steel carbonation caps well made for rust resistance and corrosionproof. Would last for a longtime in good condition. 3A must have equipment for home brew Carbonation. Ideal for counter pressure bottle filling. Fit for most soft drink PET bottles. 4Easy to set up. Just simply attach this cap with a PET bottle and a balllock gas disconnect to coupling CO2 into the bottle for beverage carbonation. 5We use premium material for the gaskets and o-rings. High resilient food safe rubber gaskets to seal against all the threads and gives you no leaks connections. Specification: Item Type: Carbonation CapMaterial: Stainless Steel Color: SilverSize: Approx. 5.8x3.3x3.3cm / 2.3x1.3x1.3in Thread Size: 5/16inWeight: Approx.105g/3.7oz Package List: 1 x Carbonation Cap4 x O-Rings Note: 1. Please allow 1‑2in 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.