Impeller KitA replacement impeller for your jet. What is an impeller? To put it simply, the impeller in our jet does the same job as a propeller on a boat. And as the propeller on a boat will get damaged by debris in the water, the impeller can get damaged by either debris or even small rocks when riding in the shallows. The jet impeller is manufactured from marine grade anodized aluminum and comes with all the hardware and instructions needed to install.