Item Type: Soda Refill Adapter_x000D_ Material: Brass_x000D_ Thread: Male thread, TR21-4, 8mm / 0.31in (approx.). 1Smart Refilling: This adapter can connect the soda making machine to the bottle to simplify the refilling without leakage. 2Standard Design: Comes with standard TR21?4 8mm male thread, the connector guarantees firm connection and perfect matching. 3Reliable in Use: Able to withstand a high pressure, the quick refilling will not loss the flavour of your soda, very useful. 4Better Material: The application of premium brass material with sturdy structure enables good durability for long term use. 5Easy to Install: Light in weight and compact in size as well, the easy installation can be completed within several minutes.1 x_x000D_ _x000D_ Soda Refill Adapter 1 x Protective Thread Cover 1. Please allow a error of 1?3cm in the manual measurement. _x000D_ 2. The monitor is not calibrated the same, so the colour of the item shown in the photo may be slightly different from the real thing. Please refer to the actual product.