Johnson Pump F3 Impeller Nitrile. Composed of nitrile materials for oil resistant properties. Designed for quick and simple installation. Features of Johnson Pump F3 Impeller Nitrile: Nitrile Impeller (Oil Resistant) For use with F3 model pumps 6 blade impeller 1.78in Diameter Included Accessories: F3 Impeller (Nitrile) Documentation Package Contents: Johnson Pump F3 Impeller Nitrile Johnson Pump 09-1052S-9: F3 Impeller (Nitrile)