Gruvmaster? GHM-4X Heavy Duty Roll Grooving Machine for large pipes is a heavy duty grooving machine designed for grooving 8" to 24" schedule 20 to 40 pipe electrically with hydraulic feeding. Powered by a 3-phase 1100W universal motor and heavy-duty transmission, it produces high quality grooves consistently and effortlessly for large diameter pipes. Except AWWA standard groove, it can adapt with interchangeable AGS roller set to groove AGS standard grooves.