Hoover "Max Extract" Steam Vacs use a air driven turbine system to power the brushes. This part fits 6 brush V-2 and All-Terrain Max Extract models including F7411, F7412-900 & F7452-900. Replaces part number H-4319018. If your brushes won't turn this is the most likely cause. When sold out price will show 00.00 dda 6/21