The Duraline Mor Clamp, 4 in, SDR (vendor part 20002857, Millennium part 619707), grips 4-inch SDR-rated HDPE conduit at repair or transition points, holding the joint secure without a full fusion weld. Conduit crews use it where a mechanical connection is faster or more practical than heat fusion, such as tie-ins to existing duct on a fiber or utility build. Its rated grip keeps the joint from pulling apart under duct tension during cable placement. Pair it with matching couplers and duct plugs for a complete 4-inch conduit repair kit.