The Duraline Splice Kit, 4-Way, 18 mm (vendor part 20003832, Millennium part 523345), joins four 18 mm HDPE duct runs at a single splice point, letting crews branch microduct networks without cutting in a full handhole assembly. It's built to Duraline's water-tight standard so the branch point holds pressure the same as a straight coupler. Conduit crews building out multi-path duct networks for fiber use these splice kits at junction points along the route. Stock it with straight couplers and duct plugs sized for the same 18 mm duct.