The RIDGID K-75A/B, K-1500A/B & K-1500SP Drain Cleaning Machines are for cleaning 11/4w through 10w lines. These machines are driven by induction motors that have a grounded electrical system. An integral Ground Fault Interrupter (GFCI) is built into the line cord. A toggle or rotary switch provides FORWARD/OFF/REVERSE control of the motor. Machines are designed to use sectional-type cable that has a quick coupling system for disconnecting tools. The cable is manually fed in and out of the machine and rotates at a cable speed of 600 to 700 RPM. The rotation of the cable is controlled by a clutch handle. The cable stops instantly when the clutch handle is released. K-75 machines come equipped to run 7/8w cable to clean 2w - 4w lines through 175v. They can be adapted to use 5/8w cable to clean 11/4w to 3w lines. K-1500 machines come equipped to run 11/4w cable to clean 3w - 10w lines through 200v - the 1500SP through 300v. They can be easily adapted to use 7/8w cable to clean 2w - 4w lines.