Keep your fuel dry. The Water Eliminator contains a drying agent commonly used to keep small, sealed containers dry. It absorbs water that has collected in your fuel tank, leaving your fuel moisture free. How to use it: Attach the Water Eliminator to the inside of the fuel cap with the lanyard (included). Adjust the lanyard so the Water Eliminator sits at the bottom of the fuel tank. Be sure to check the Water Eliminator every time you refuel and replace it when it becomes full.