Simba Butane Gas Cans are specifically designed for use with refillable butane powered lighters. Simba makes suitable gas canisters for butane fuel that works with all butane powered domestic products. TO FILL: Choose the appropriate adaptor for your lighter. Holding the can firmly near the top, invert and press the nozzle into the lighter’s filling recess. Escaping gas indicates either wrong adaptor, can and lighter not in alignment, or lighter is full. Check can instructions.