These RV Vent parts are useful with your roof vent repairs. The RV vent parts featured here are a crank operator assembly and a replacement 12V fan blade. These replacement fan blades fit any vent motor with a 1/8" "D" shaft (shaft has one flat side). Blades may be for clockwise rotation or counter-clockwise rotation. Rotation is determined by looking down past the motor to the top of the fan blade.