Manhole Invert Channel Systems from RELINER/Duran include molded fiberglass flumes with smooth sewer pipe interfaces that are used to rehabilitate inverts without flow interruption and are also used for new construction. The field-installed modular components bolt together inside the manhole and serve as the form for a new concrete bench, eliminating the inconsistencies associated with field-formed concrete channels. The full depth lined channels are high-flow and easy to clean and maintain. Standard 8- and 12-inch depth channel sections fit through a 24-inch manhole frame and will accommodate 6- through 12-inch pipes. Larger sizes are available. 800-508-6001; www.reliner.com.