Steel/Cadmium Plated Pitman Arm attached to the hydraulic gearbox. This pitman arm has an engraved #2 on the face of it. As of 10/1/97 this pitman arm has been designed with an additional hole (see picture). The center hole has a 3" stroke for quieter operation and the hole off to the side gives a 3-1/2" stroke and can be used for additional cleaning. note: Not compatible with mitter curtains WS1000, WS802, Whip A Cross600, Whip A Cross310 reference #100692. note: Wave Mitters use (1) #1 and (1) #2 Pitman arm on each gear box. Used on: Quad Wave Mitter Twin Wave Mitter Three Legged Wonder Wave Across