I used this to change the oil in our jetskis back when we had them. Made it possible for me to change it myself and not have to pay a ton for a dealer to do it. The two flaws that stand out to me (and prevent me from giving full five stars) are the very small tube which makes the evacuation project slower and the fact that the top vacuum pump is not permanently attached. There is already a spout to dumb out the oil on the side. Why have the pump not attached? It just makes it more difficult to keep the pump from loosing vacuum.