The Steiner ST-20 Turfmaster is a 4x4 lawn tractor produced from 1982 to 1987 as part of the MPV Series. It features a 20 hp Onan B48G 781cc 2-cylinder air-cooled gasoline engine with hydraulic drive transmission offering infinite forward and reverse gears. The tractor has an open operator station and uses a 12-volt electrical system with negative ground.