HUMAN-MACHINE DIALOG requires devices such as push buttons and selector switches to provide command inputs. A wide variety of these devices are available to meet most application needs; in both pneumatic and electrical switch bodies. All of these devices use the 22 mm (7/8 #34;) mounting standard. * Type of switching: Universal 3-way: valve can be connected either as NP or NNP as required by connecting the primary air supply to port 1 or port 3. Note: Mount up to three valves on mounting ring. Complete Assemblies 3/2 Valve Bodies with 5/32 #34; Instant Straight Connections Operating Pressure 30 to 150 PSI (310 to 1035 kPa) Operating Temperature 5F to 140F (-15C to 60C)