Ammann APR 49-20 Reversible Plate Compactor 17.7" Hatz Diesel 1B40 8.2 kW (Base Unit)Ammann APR 49 20 Reversible Plate Compactor 17. 7" Hatz Diesel 1B40 7. 3 kW (Base Unit) The APR 49 20 features good maneuverability and power with an 8,2 kw engine available to help with climbing and, ultimately, compaction. The machine performs at grades up to 30 per cent. The APR 49 20 is heavier than most of the vibratory plates with the exception of the APR 59 20. Working widths of 450 mm can be broadened with extensions of 75 mm and 150 mm. The