Scepter's patented "Spill-Proof Spout" is designed to eliminate spilling. Through the self-venting spout, the design provides an automatic shut-off, that engages when the fuel tank reaches capacity. Making this tank a necessity for families and especially kids. The dual function, reduces the amount of potential organic gases that can escape from traditional gas cans. We know that this can be harmful for people to breath and can cause smog-forming pollution. So be health and environmentally cautious. Scepter has designed these just for that purpose.