Abstract: A multi-vane impeller for use upon a watercraft such as a jet ski is provided having an integral hydraulic compression ring permanently affixed to the outer end portions of the vanes. The impeller eliminates a need for the wear ring portion which is commonly provided on most jet skis, and is expected to improve efficiency and reduce maintenance costs. It is envisioned that the impeller would be provided as standard or optional equipment on new jet ski designs as well as being made available as an add-on kit for existing jet skis.