Operators are all aluminum except for certain movable parts which are stainless steel, all other parts such as screws are either stainless steel or plated steel. Threaded bodies are all 3/4 in -14 NPSM thread. Control stations can be grouped into a single assembly thus reducing installation time and cost. Junction boxes may be used to mount operators along with glass lens for viewing internally mounted meters. Additional relays, timers, terminal blocks or other equipment may also be internally mounted to provide a single centralized control unit.