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243-0009 | Multi-Purpose Relay, Pneumatic, Heavy Duty, Two-Valve Design, DA and RA | Siemens Dimensions_2.64 in L 1/4 SB BLKHD UNIONMulti Purpose Relay, Pneumatic, Heavy Duty, Two Valve Design, DA and RA This 243 Heavy Duty, Multi Purpose Relay is a pneumatic auxiliary device designed to provide a variety of pneumatic control functions for the typical control system. This multi purpose relay has a two valve design which prevents constant air loss, an internal relief mechanism for fail safe operation and an operational ambient temperature range of 40 to 120 degrees Fahrenheit.