New Pig Fuel Tank Water Absorbers are easy to use, just drop into a fuel-tank port for fast absorption of water without absorbing the fuel. Designed to remove water from fuels such as gasoline, diesel, kerosene, jet fuels, or home heating oil. Prevent premature engine wear and potential failure by using these water absorbing snakes to combat rust, algae and filter blockage. The attached nylon string allows for easy deployment and retrieval. Caution: not to be used with on-road passenger vehicles, tanks with antiphon mechanisms or tanks with fill necks.