It adopts a quick-plug design, allowing for the rapid installation of the air pipe solenoid valve The external threaded steel bottle design prevents external stains and avoids stuck Precision pressure gauge, accurate reading Advanced sealing ring + 3-stage filter element<br><br>Please add raw materials according to the following ratio:2L: Capacity: 200g citric acid +200g baking soda + 300ml water. After adding the proportion of raw materials, shake it left and right evenly. Let it stand for 10 to 20 minutes and wait for the pressure gauge to gradually show the pressure (Note that water mist, water droplets and low temperature phenomena on the outside of the raw material reaction cylinder are normal reactions.) There is no need to worry After the reaction is completed, install the solenoid valve bubble gauge connect the power supply and open it for use. Power supply: AC100-240V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Colour:As Shown Material:Stainless Steel + Aluminum Alloy<br><br>Package Contents: 1 x CO2 generator 1 x solenoid valve<br><br>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.