F3B Impeller Kit. Made of nitrile rubber material specific to transfering oil compounds. Fits Johnson Pump F3B-19 flexible impeller pump part numbers 10-24760, 10-24516 and F3B Oil Kit/Bucket part number 65F3B. Flat drive type, 8 blades, outer diameter 1.78" (45mm), width 0.5" (13mm) and inner diameter of 0.31"