Du-Bro Fuel Line Plugs \(for Gas & Glo\) Part No: 617. The Du-Bro Fuel Line Plugs work with gasoline and glo fuel. They can be used to temporarily shut off fuel and air lines. Small plug is for 1/16" \(1.5 mm\) and 3/32" \(2.3 mm\) size tubing. Conveniently packaged with \(2\) small and \(2\) large plugs.