REBOX® Trim Kit 32"- The trim ring kit is an accessory for Hubbell’s Commercial REBOX enclosures that provides a finished look for flush mounting applications. For applications where the installer might want to recess the REBOX enclosure into the wall to save space or to conceal cables and conduit, the trim ring provides a perfect way to complete the flush mount installation. In addition, louvers for proper venting of the enclosure are provided and designed to minimize the ingress of dust and dirt.