This 2-foot (0.6m) neoprene tubing hose connects laboratory burners to fuel sources such as liquid propane, butane, or natural gas. It is designed to fit gas inlet connectors with a diameter of 8-10mm, with an inner diameter of approximately 7mm and outer diameter of approximately 12mm at the tube ends. The flexible, resilient neoprene construction is suitable for connecting Bunsen, Tirrill, Meker, and other laboratory burners. The hose should always be used in a lab setting connected to a gas jet and never connected directly to a fuel source. Inspect before each use to ensure there are no holes or cracks.