20 LB CO2 ALUMINUM CYLINDER TANK NEW WITH DIP TUBE - SHERWOOD CGA 320 VALVE, CARRY HANDLE (HOMEBREW BEER KEG HYDROPONICS) 20 Lb. Co2 Aluminum Cylinder With CGA 320 Valve, Carry Handle, And Dip Tube (We also carry a complete line of compressed gas cylinders valves and parts) 8.0 inch diameter, 28.2 inch length, 1.125" UNF inlet thread. Cylinder with valve, Shipped Empty,Do Not tilt it or lay it on its side.