This is the most versatile Bunsen burner is used for safe continuous stream of flammable gas used for heating, sterilization and combustion. This burner is equipped with an air flow adjustment sleeve, brass gas adjustment and brass flame stabilizer tip. This is a very simple easy to use burner jetted for natural gas. Natural gas burners have a BTU range usually 800-1200. Maximum Temperature is approximately 1500° C (2732° 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.