SBT's Delrin wear rings are created as a replacement to OEM wear rings for your Seadoo. The Seadoo wear ring aids in stopping speed-robbing cavitation in your worn jet pump. Our SBT Delrin wear rings and liners will restore the tight clearance to your impeller. A Jet Ski or SeaDoo wear ring is a sacrificial ring that is installed into the jet pump to provide a minimal clearance for the impeller to build thrust.