Transmission drive unit for Self-Propelled Wind Tunnel upright vacuums built after 2000. Sold as complete unit and includes the idler arm and drive pulley. Unit is what pushes the unit both forward or reverse for easy cleaning. Models include U6420, U6425, U6430, U6431, U6445, U6449, U6450, U6451, & U6455. Part is remanufactured and tested by factory trained rep. Part as new was $145.00 but is no longer available as a new part from Hoover. Our inventory as of this listing is about (*22 units) When sold out the price will show $00.00 Updated *6/3/2022 dda