An electric drive unit includes an electric motor, which has a stator and a rotor, a gearbox, an electric circuit and a housing. Hard polishing pads consisting of foam resins show good pattern step difference elimination, but tend to cause scratching of the wafer. A fire hydrant with a sprinkler cap having a plurality of sprinkler ports and a sprinkler cap control lock, wherein the sprinkler cap control lock covers and prevents access to the operating nut is also described.