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.