Three Navigator horizontal directional drills offer upgraded performance and features. D36x50 Series II has increased horsepower to 140, and an optional onboard mud pump offers 70 gpm variable flow. The HDD has 36,000 pounds pullback force; and 5,000 ft.-lbs. torque. D20x22 replaces the D18x22 and has double the carriage speed. D10x14 has 1,400 ft.-lbs. of torque and 9,600 pounds of push/pull.