The Commercial Wet Belt Sander is designed for production type work. 3" x 41-1/2" size belts provide greater sanding surface and an extended belt life. This unit comes complete with a 4" high back plate, 1/3hp motor, belt guard, rustproof aluminum topped Lam-I-Cushion base, instructions and product guarantee. A water valve and spray nozzle are built in for easy hookup. The water valve takes 1/4" OD plastic tubing for gravity water flow or 1/4" copper tubing for pressure systems. This sander ships with the motor attached, ready to plug in and operate."