WaterWacker Propeller: This 2 blade propeller is for curved shaft weed eaters. 5.5 Dia Counter-Clockwise Rotation.
All Weed Eaters: When you pull the starter rope, looking at the top of the engine, the engine turns CW. Looking from the drive shaft end the rotation is CCW. If your weed eater has a gear box the rotation is reversed inside the gear box; and the drive is now CW. Therefore if you have a weed eater with a gear box you need a CW Propeller. If you have a curve shaft weed eater, which does not have a gear box, you need a CCW propeller.