Acerbis auxiliary tanks mount on the front forks in place of the front number plate/headlight. They carry extra fuel to increase fuel and fun range! Included mounting kit secures them to most front forks. The included siphon kit integrates the auxiliary tank with the bikes main tank, allowing fuel to siphon from the auxiliary tank to the main tank while riding; there is no need to stop. The siphon kit drains the auxiliary tank completely before the main tank capacity is used.