A convenient jack for passing standard 2.1 mm x 5.5 mm DC power in or out of the pedalboard. Makes it easy to power an external wah or as a courtesy DC port for auditioning new effect pedals. Could even be used to pass DC power to a smaller expansion board with a compatible 2.1 mm modular power supply.
 
Mounts easily into one of the two IEC ports on X-Series pedalboards, or can be mounted into the second IEC port on the back wall of a P-Series pedalboard. 

This cable requires an external power source, it does not generate any power. Max 5A.