This academic Bunsen burner is used for safe continuous stream of flammable gas used for heating, sterilization and combustion. This burner has one adjustment which is an air flow adjustment sleeve and brass flame stabilizer. This burner has one adjustment which is an air flow adjustment sleeve. The version of burner is designed to have the flame controlled via the valve at the gas output, not at the burner. This is a very basic simple easy to use burner jetted for natural gas. Liquid propane burners have a BTU range usually 2,000-3,200. Maximum Temperature is approximately 1,550° C (2,822° F) There are a number of burners offered with different options. Basic Burner (CH0991NG & CH0991LP) Very basic easy to use burner, usually selected based on price. Academic Burner (CH0992NG & CH0992LP) Burner with Flame stabilizer; Most common basic academic burner with air flow control. Versatile Burner (CH0993NG & CH0993LP) Burner with Flame Stabilizer and gas adjustment. Bestselling and most used burner due to flexibility to control and gas and air flow to the flame. Micro Burner (CH0994NG & CH0994LP) compact space restrictions when space and height is a concern. Tirrill Burner (CH0995NG & CH0995LP) burners for specialized finely controlled air gas mixture. Meker Burner (CH0996NG & CH0996LP) for hotter flames. All burners are available for both liquid propane and natural gas.