The FlexShaft drain cleaning machine from RIDGID cleans 1 1/4- to 4-inch residential and commercial pipes up to 70 feet. The lightweight and fully contained machine is used in conjunction with specialized accessories designed for clearing grease, sludge, small tree roots and soft blockages with less mess and enhanced speed. The FlexShaft utilizes powerhouse chain knockers that expand to the size of the pipe to quickly clear the entire circumference. The chain knockers are connected to a flexible, nylon-sheathed cable housed in a fully enclosed drum and powered by a cordless drill attached to the drive shaft. 800-769-7743; www.ridgid.com.