Design upgrade: version CO2 Tank Direct Adapter, With pressure gauge and air venting valve, The pressure gauge provides a clear view of the working pressure and residual gas, and the pressure relief valve allows air to be discharged when required, Easier to use. Scope of Application: Special for the Art Terra Soda Machine, Can help you connect large CO2 tanks to bubble makers, including Terra,DUO,Art, and Aqua Pink Carbonators Series of pink cans, But it can't make a connection to the Blue CO2 cylinder connect system. This item works CO2 only, not liquid CO2. can't use. High-quality manufacturing: CGA320 Soda Machine Co2 Adapter Quick Connector Hose, Made of high standard metal and caoutchouc, Anti-rust, anti-corrosion, wear-resistant, anti-aging, not easily deformed, The rubber ring is made of food-grade rubber, Strong sealing, Ensuring safety and reliability, And it 't affect the taste of carbonated water. Cost savings: This upgraded version CO2 Tank Direct Adapter, Easy to install