Coupling, Slip x Slip PVC Schedule 40 8" (429-080)

The 8" PVC Schedule 40 Coupling (Slip x Slip) joins two sections of 8" Schedule 40 PVC pipe in a straight, inline solvent-weld connection. Both socket ends accept 8" PVC pipe via solvent cement, creating a permanent, leak-free joint suited for large-diameter water distribution, gravity drain, municipal infrastructure, and commercial piping systems where a reliable, pressure-rated inline connection is required.

At 8", this is among the largest standard fittings in the Schedule 40 PVC slip coupling range — a size category that transitions firmly out of typical commercial plumbing and into civil, municipal, and industrial infrastructure applications. Couplings at this diameter are most commonly used to join pipe sections in long straight runs, repair damaged sections of existing 8" pipe without replacing the full run, accommodate field-cut pipe lengths during installation, and connect pipe spools to equipment or structure penetrations where a solvent-welded inline joint is the specified connection type.

Proper technique is especially important at 8". Large-diameter PVC solvent-weld joints require liberal, even application of primer and cement across the full socket depth and pipe circumference, and assembly must be completed quickly before the cement begins to set — the larger bonding surface area at this diameter leaves less margin for slow or incomplete assembly. Cure time before pressurization or service should follow manufacturer guidelines for the cement type, ambient temperature, and pipe schedule in use.

Manufactured to ASTM D2466 standards and listed under NSF/ANSI 14, the 429-080 is molded from white Schedule 40 PVC, providing reliable chemical resistance and structural integrity across a wide range of water, wastewater, drainage, and low-pressure process piping applications at this large format size.

Specifications:

Industries & Applications:

• Municipal Water Distribution — Installed in 8" water main runs, distribution system extensions, and service infrastructure where solvent-welded PVC couplings are specified to join pipe sections, close field-cut lengths, and complete inline connections in large-diameter potable water systems
• Municipal Sewer & Gravity Drainage — Used in 8" gravity sewer mains, stormwater collection systems, and municipal drainage infrastructure where a permanent, leak-free inline coupling is required to join pipe sections or repair damaged runs without full pipe replacement
• Civil & Site Construction — Applied by site contractors in underground utility runs, detention system outlet pipes, culvert extensions, and stormwater conveyance systems where 8" PVC is specified and field-cut pipe lengths require a coupling to complete the run
• Industrial Process Piping — Used in large-diameter process water supply, cooling water distribution, and plant utility piping where 8" Schedule 40 PVC provides the chemical resistance and pressure rating required and inline couplings are needed to join pipe spools or complete field installations
• Irrigation & Water Management — Installed in large-scale agricultural and landscape irrigation mainlines, pump discharge headers, and reservoir distribution systems where 8" solvent-welded PVC runs require couplings to join field-cut sections or complete long straight runs
• Water & Wastewater Treatment — Applied in treatment plant process piping, effluent distribution headers, and gravity-fed treatment infrastructure where 8" Schedule 40 PVC couplings join pipe sections at equipment connections, structure penetrations, and inline transition points across the facility