Coupling, Slip x Slip PVC Schedule 40 6" (429-060)

The 429-060 is a 6" PVC Schedule 40 coupling with two slip (socket) ends, designed to join two sections of 6" PVC pipe in a straight, inline configuration using solvent cement welding per ASTM D2564. Both socket ends accept standard 6" PVC pipe ends, producing a permanent, pressure-rated joint at each end and creating a continuous, leak-free large-diameter pipeline run without mechanical fasteners, gaskets, or threaded connections.

Manufactured from rigid PVC compound conforming to ASTM D1784 cell classification requirements, this coupling delivers the corrosion resistance, chemical compatibility, and long service life associated with Schedule 40 PVC across a wide range of commercial, industrial, and municipal piping applications. The Schedule 40 wall thickness provides reliable pressure-rated performance for both pressurized distribution systems and gravity-flow installations, and the all-PVC construction resists corrosion, biological fouling, and a broad range of chemical media throughout its service life.

At the 6" size, the slip coupling is a large-diameter specialty fitting that serves three well-defined roles in PVC piping systems. In new construction and phased installations, it joins two sections of 6" pipe end to end to achieve the required run length across a manifold, distribution header, or mainline extension. In system expansions, it extends an existing 6" pipeline by connecting a new pipe section to an established run without requiring additional transition fittings. In repair and maintenance applications, it restores a damaged or compromised 6" pipe section by cutting out the affected segment and coupling in a replacement length — the most common emergency and planned maintenance use case for couplings in large-diameter pipeline systems. The all-slip configuration produces two permanent solvent-welded joints, appropriate for installations where long-term, maintenance-free performance is the priority and the pipeline connection will not require future disassembly. For applications requiring a breakable inline connection at the 6" size — for equipment access, future sectioning, or planned maintenance — a 6" Schedule 40 union should be considered instead of this permanent coupling.

Specifications:

Industries & Applications:

• Municipal Water & Wastewater — Joining, extending, and repairing 6" Schedule 40 PVC pipe runs at pump stations, treatment facility distribution headers, water main assemblies, and large-diameter service connections where a permanent, pressure-rated inline joint is required
• Irrigation & Agriculture — Joining 6" mainline pipe sections in large-scale pressurized irrigation systems, extending trunk main runs during system expansion, and repairing damaged pipe sections in buried or above-ground 6" distribution networks
• Fire Suppression — Coupling 6" fire suppression main and riser pipe sections in large commercial and industrial fire protection systems where permanent, pressure-rated inline joints are required throughout the mainline distribution network
• Industrial Process Piping — Joining and extending 6" pipe runs in chemical distribution, cooling water, and process fluid systems where corrosion-resistant, permanent inline connections are required at large-diameter pipeline junctions
• Commercial Plumbing — Joining 6" primary supply and distribution pipe sections in large mechanical rooms, building service entries, and commercial distribution headers where long-run large-diameter PVC is specified for the primary supply infrastructure
• Aquaculture & Water Treatment — Coupling 6" supply and distribution pipe sections in large recirculating aquaculture and water treatment systems where long mainline runs require multiple pipe lengths to be joined into a continuous, leak-free large-diameter distribution header