The K-3800 Drum Machine is a powerful, easy to transport, versatile machine for cleaning indoor drains. For 3/4" (20 mm) to 4" (110 mm) Drain Lines. Rugged, corrosion-resistant molded cable drum won’t dent or rust. The drum tilt adjusts for proper cable feed angle. Inner-drum guards against cable flip-over inside the drum. Powerful 1/10 HP universal motor spins cable at 240 RPM. When cable hits blockage, motor gears down automatically to deliver more power and enhance operator control.