Natural Gas Bunsen Burner - for use with Methane Gas Supply Nickel-plated burner tube with rotatable air regulator and a cylindrical riffled connector mounted on an enamelled pressed-steel base.For use in schools with a piped Methane/Natural gas supply.Burner Tube Dimensions: (H)100mm x (D)13mm Overall Height: 140mmConnector Outer Diameter: 10mmBase Diameter: 80mmFor tubing please see code B8A89667 - 8mm Bore 2mm Wall.