We offer a wide variety of cylinder sizes depending on the type of gas you are looking to purchase. From the Pictures below, the top left picture includes some of the cylinder sizes from our selection of industrial gases. The top right picture contains the various Carbon Dioxide cylinders available for purchase at Conroe Welding Supply.(Missing from this picture is the 50 lb tank as well as a CO2 vessel.) The bottom left picture displays a few of the propane tanks we sell. (Missing from this picture are the 8 gallon forklift tanks as well as the 25 gallon cylinders that we sell.) And on the bottome right, a few of the various Medical Oxygen cylinders available at Conroe Welding Supply are displayed.