General Pipe Cleaners’ Sewerooter T-4 mid-size drain cleaner can unclog 3” to 6” diameter lines up to 100 feet long. The Sewerooter T-4 carries 100' of 9/16” Flexicore cable to clear stubborn stoppages in 3” to 4” inside lines. Heavy- duty 9/16” cable provides more torque than traditional 1/2” cables offer, yet can clean the same size drain lines. To adjust to different cable sizes, just turn a knob atop the feed. No screwdriver required.