GT40H 2T0951247/AT3. GT40H Twin 2T0951247/AT3. GT40H Twin 4WD 2T1425247/AT8. Toothed Deck Drive Timing Belt for Atco Lawnmower. The double sided type (teeth on both sides) being very common in twin blade deck drives, ensuring the timing of the blades is kept constant to avoid the blades clashing.
