Versatile Compatibility: This CO2 refill adapter is designed for use with standard large CGA320 CO2 tanks. It seamlessly connects to screw-in CO2 canister sparkling water makers like for TERRA, for ART, for DUO, for GAIA, for E-TERRA, and for CRYSTAL 3.0. Note: It is not compatible with for TR21-4 Co2 canister machines or tanks with RPV (Residual Pressure Valve). Practical Application: Facilitate the refilling process from large CO2 cylinders to portable for Stream bottles with this adapter. Ideal for both industrial and home use, the adapter features a round side for CO2 cylinders and a hexagonal side for Stream bottles, simplifying the refilling process. Durable Construction: Crafted from high-quality aluminum alloy, this CO2 cylinder adapter is polished and electroplated for superior corrosion resistance. It is designed to prevent leaks and rust, withstand high temperatures, and offers low magnetic permeability, ensuring durability and a long service life. User-Friendly Installation: Installing this CO2 adapter is straightforward. Attach the adapter to the CO2 cylinder, connect the empty for Stream bottle, and carefully open the valve. In about 15-20 seconds, your bottle will be refilled, ready for use. Comprehensive Accessory Kit: Included with the CO2 refill adapter are 6 sealing rings made from food-grade materials to ensure a tight, leak-proof connection. The kit contains 3 large and 3 small rings, providing replacements to maintain optimal performance over time. Colour:Photo Color Material:Aluminum Alloy Package Contents: 1 x CO2 Refill Adapter Connector Kit 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.