The S906M1-AK Advanced Kinetics hydraulic maximum-duty root cutter motor from Southland Tool is built from the same platform as the S906-M-1, but upgraded internal parts make it smoother, improving hydraulic performance and nearly eliminating internal corrosion. The finish improves the friction coefficient, allowing parts to run smoother while reducing drag and saving water. Denser metal wards off corrosion and wear. It is designed for lines from 6 to 30 inches in diameter. The motor can accommodate hose sizes of 3/4, 1, 1 1/4 and 1 1/2 inches without being brushed down or up. It can handle flows from 40 to 170 gpm and pressures from 1,500 to 3,000 psi. It is rated up to 288 pounds of torque maximum, and 220 pounds continuous. 714/632-8198; www.southlandtool.com.