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: 8mm Base Diameter: 150mm Overall Height: 100mm Connector Outer Diameter: 9mm (so N8