Ammann APR 59-20 Reversible Plate Compactor 17.7" Hatz Diesel 1B40 6.6 kW (Base Unit)Ammann APR 59 20 Reversible Plate Compactor 17. 7" Hatz Diesel 1B40 6. 6 kW (Base Unit) This reversible vibratory plate offers manoeuvrability and great climbing with an ability to work on 30 percent grades. High performance diesel engines power the machines. The variable forward and reverse motion helps the vibratory plates overcome particularly difficult spots in hard to reach places. At 440 kg, it is the heaviest of the APR vibratory plates. Its