4 poles electrical motor (1450 RPM) with thermal protection and water cooling. Three ceramic pistons, brass linear pump head with built-in by-pass valve. Integrated elastic joint, for best pump coupling (three phase models). Low voltage and delayed Total Stop (three phase models). Suction and delivery S/S valves. Integrated detergent suction with external suction probe. Pressure regulator. Glicerine pressure gauge.  Hose-reel (optional). Steel frame. Steel covers.