Coupling, Slip x Slip PVC Schedule 80 3/4" (829-007)

This 3/4" Schedule 80 PVC Coupling provides a permanent, pressure-rated inline joint between two sections of 3/4" PVC pipe in solvent-cemented Schedule 80 pressure piping systems. Both slip socket ends accept standard 3/4" PVC pipe for solvent cement joining, producing a continuous, straight-run connection that maintains full system pressure rating through the joint.

The coupling serves three core functions in any PVC piping system: extending a pipe run by joining two pipe lengths end to end, connecting pipe to other slip socket fittings at either socket end, and providing a repair joint when a damaged section of pipe must be cut out and replaced. At 3/4", these functions occur across a specific and well-defined set of system types where 3/4" Schedule 80 PVC is the specified pipe size. Chemical dosing and injection systems — where the elevated Schedule 80 pressure rating is required at every joint in the dosing header — rely on the 829-007 as the standard inline joining coupling at every pipe-length connection and field repair position. Irrigation control valve connection runs, instrument supply distribution mains, and secondary distribution branches in process and commercial mechanical systems all position the 3/4" coupling as a routine construction and maintenance component.

At 3/4" Schedule 80, the elevated pressure rating — approximately 690 psi at 73°F — distinguishes this coupling from its 1" sub-series sibling (829-010) in a meaningful way. Where the 1" coupling at ~450 psi serves the broad primary header and distribution contexts common across all commercial and industrial Schedule 80 system types, the 3/4" coupling at ~690 psi is specifically well suited for the high-pressure chemical dosing headers, irrigation control valve supply runs, and instrument supply distribution systems where 3/4" Schedule 80 is chosen precisely for its pressure performance advantage over Schedule 40 equivalents at this common small-bore pipe size. In these high-pressure contexts, using a Schedule 80 coupling at repair and extension points preserves the system's full pressure rating at the coupling position — a Schedule 40 coupling substitution at a Schedule 80 coupling position introduces a rating discontinuity that the 829-007 eliminates.

The all-socket construction of the 829-007 integrates seamlessly into solvent-welded Schedule 80 systems, maintaining pressure rating consistency through every inline joint without threaded interfaces that require periodic inspection or re-torquing. The permanent, chemically fused joint at each socket end — once cured — is as strong as or stronger than the pipe itself, providing a maintenance-free inline connection at every coupling position in the 3/4" Schedule 80 system run.

Manufactured in dark gray Schedule 80 PVC, this coupling delivers the increased wall thickness and mechanical strength required in industrial, chemical, and commercial pressure piping where Schedule 40 ratings are insufficient. PVC's broad chemical resistance covers acids, bases, salts, chlorine, and most common process fluids, providing long service life in corrosive environments where metal couplings would degrade, corrode, or introduce contamination. NSF/ANSI 61 listing confirms suitability for potable water contact.

Rated to 690 psi at 73°F, this coupling handles standard to elevated pressure service across the full range of 3/4" Schedule 80 PVC applications. For installation, clean and dry both pipe ends and socket interiors before application. Apply purple PVC primer to all mating surfaces, then apply a uniform coat of Schedule 80 PVC solvent cement to both the pipe end and socket interior before joining. Insert the pipe with a slight quarter-turn twist and hold firmly for 30 seconds to prevent pushback. Stagger the two joints where possible and allow full cure time per the cement manufacturer's temperature and humidity guidelines before pressurizing. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Chemical Dosing & Injection Systems — The defining application for the 3/4" Schedule 80 slip coupling: joins 3/4" Schedule 80 PVC pipe sections end to end in chemical dosing headers, injection quill supply runs, reagent distribution mains, and dosing loop assemblies where the elevated Schedule 80 pressure rating is required throughout the cemented system and the coupling must maintain schedule consistency at every inline joint in the dosing piping
• Irrigation Control Valve Assemblies — Extends and repairs 3/4" Schedule 80 PVC solvent-welded runs in irrigation control valve connection assemblies, filter station piping, and pump station outlet runs where Schedule 80 construction at valve station connections provides the pressure performance required for high-pressure commercial and agricultural irrigation systems
• Industrial Process Piping — Joins 3/4" Schedule 80 PVC pipe sections on secondary process headers, chemical distribution branches, pump manifold connections, and equipment supply connections in water treatment, chemical processing, and manufacturing facility piping; provides schedule-consistent repair joints when pipe sections require replacement in existing 3/4" Schedule 80 solvent-welded systems
• Instrument Supply & Control System Piping — Extends and repairs 3/4" Schedule 80 PVC instrument supply mains and distribution runs at section connections and field repair joints in instrument supply systems where the 3/4" pipe size serves primary instrument supply distribution functions requiring Schedule 80 pressure performance through every coupling joint
• Commercial Plumbing — Joins 3/4" Schedule 80 PVC pipe runs in mechanical room and building utility system secondary branch supply mains, equipment feed connections, and distribution assemblies where Schedule 80 pressure rating is specified and the coupling maintains pressure rating continuity through every inline joint in the 3/4" cemented system
• Water & Wastewater Treatment — Provides inline pipe continuity on 3/4" Schedule 80 PVC chemical dosing supply lines, instrument connection runs, and secondary distribution headers at pipe-length connections and field repair joints in municipal and industrial water treatment facilities where the coupling must maintain full Schedule 80 pressure rating at the 3/4" inline joint position
• HVAC & Mechanical Systems — Used in 3/4" Schedule 80 PVC cooling tower chemical feed lines, treated water distribution branches, and glycol system connection runs where schedule-consistent inline joining at the 3/4" pipe size maintains full pressure rating through every coupling joint in commercial mechanical system piping