Festo CPA VI Series Manual page 40

3. Installation
Internal
auxiliary
pilot air
3-6
If the supply pressure of your CPA valve terminal lies
between 3 and 8 bar, you can operate it with internally
branched auxiliary pilot air. The auxiliary pilot air is
taken from connection 1 in the right-hand end plate.
If the CPA valve terminal is used with internal auxiliary
pilot air, the centre connection must be sealed with a
blind plug or threaded blind plug (see diagram).
Connection sealed with blind plug
Fig. 3/2: Internal auxiliary pilot air
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CPA... 9808A