Seamless aluminum CO2 cylinder,TUV/DOT approved, safety and quality assured. Adjustable supporting base prevents cylinder and regulator from falling down. Aluminum alloy CO2 flow regulator provides accurate and reliable CO2 output,easy in installing and disassembling. 2 in 1 CO2 diffuser ensures the best dissolving rate, convenient to change the ceramic disc. Stainless spring check valve ensures no water backflow, Air pipe fastening nuts promise no CO2 bursting out. Air pipe holder included, preventing air pipe from being bended and clogged.