Connection Seal in Denver. Perma-Liner traveled to the Denver area to provide demonstrations on the InnerSeal Innerwrap Lateral Connection Seal. This system was designed specifically for the connection of service laterals to the main sewer line. The InnerSeal Innerwrap Connection Seal utilizes two independent bladders and a semi-wrap in the main line. If you are in Denver area and would like to know more about the connection seal, please call us at anytime or visit www.youtube.com/PermaLiner for videos.