For air actuated valves
![air actuator position feedback](../act/images/pfaf.jpg)
This optional position feedback can be field installed on any two position standard air actuator. Each position provides a contact closure for TTL logic level signals.
For manual valves
![manual valve position feedback](../act/images/pf.jpg)
An optional position feedback fits manual Valco W type and Cheminert C2 and C4 series valves. The continuous contact closure can remote start a chromatograph or data system.