TUV safety regulation approved seamless aluminum CO2 cylinder. Supporting base prevent CO2 cylinder from falling. CO2 controller can precisely control CO2 dosing and time of output, avoid CO2 waste. Twin setting timer provides two sockets for controlling CO2 supply and lighting respectively. 3 in 1 compact V CO2 Diffuser-L, with CO2 bubble counter, check valve and diffuser, easy in installation. Assure the best diffusing effect, easy to replace ceramic disk. CO2 indicator provides continuous and accurate monitoring CO2 level. With reusable CO2 color chart sticker, CO2 concentration can be read easily. Air pipe holder included to prevent air pipe from being bended.