The Deluxe Commercial Wet Belt Sander is designed for high production work. This machine sands, grinds, and polishes large or heavy pieces. The deluxe sander is equipped with a 1/2hp motor, a 13" high back plate, a 4" high back plate, belt guard, instructions, and product guarantee. A water valve takes 1/4" OD plastic tubing for gravity water flow or 1/4" copper tubing for pressure systems. The 13" high back plate makes it possible to wet sand flat surfaces vertically. This unit ships with the motor attached, ready to plug in and operate.