Pentair IntelliCenter® 522033 i5X Expansion Kit + Relay - IntelliCenter is Pentair's highest-capacity and most service-friendly control system ever. Communication with this system can be done on a wide range of devices and platforms. Many important service, programming and monitoring tasks can be done without an on location service call. Order popular bundled systems and receive everything in one box or build systems a la carte. The i5x is an expansion kit.