For use with the lower unit oil, this pump is a must for maintaining outboard or I-O drive units. It is made from plastic resins that resist deterioration from petroleum or synthetic compounds. It has a heavy duty adapter with an O-ring for proper sealing. The Lower Unit Gear Oil Pump will save you loss of product by being able to remove all of the lower unit oil from the bottles, not like in a squeeze tube. Will fit all standard gear oil bottles and comes in a plastic bag for storage.