Description of Brunton FuelTool Butane Fill Adapter Brunton's accessory that’s a necessity, the FuelTool has become quite a popular item. Screw it on to any thread-mount butane fuel canister to fill butane lighters and lanterns directly. There’s no need for expensive cylinder fuels when you can get it straight from the butane canister. A protective guard keeps the needle safe and straight. Features: 1.5”x0.5” Weighs just .9 oz.