The 2368 Series Electric Pneumatic Relays are 3-way,
2-position, electrically activated air valve for use in pneumatic
control systems where the application requires a variety of
switching, diverting, or interlocking functions, actuated by an
electrical circuit. The 2368-500, 501, 502, and 503 have one
SPDT pneumatic circuit that they switch, while the 2368-520,
521, 522 and 523 are designed with DPDT pneumatic
switching (two independent SPDT pneumatic circuits).