Coupling, Slip PVC Schedule 80 3" x 2-1/2" (829-339)

The 3" x 2-1/2" PVC Schedule 80 Reducing Coupling (Part No. 829-339) is a pressure-rated, gray-body fitting designed to transition a solvent-cemented Schedule 80 PVC pipe run from 3" down to 2-1/2" in a single inline component. Both ends accept solvent-cement joints in a slip (socket) configuration — the larger end receiving the 3" pipe and the smaller end receiving the 2-1/2" pipe — producing a rigid, leak-resistant transition suited to the elevated pressures and chemically demanding environments where Schedule 80 is specified.

The reducing coupling is the most direct and compact approach to an inline pipe size reduction, combining the transition into a single fitting rather than pairing a full coupling with a separate bushing or a back-to-back adapter assembly. This keeps the installed assembly short, minimizes joint count, and reduces potential leak points — all meaningful considerations on Schedule 80 pressure systems where fitting integrity and system compactness are active design priorities.

The 3" × 2-1/2" size combination is a one-step reduction between two adjacent nominal pipe sizes — a relatively modest step-down that reflects careful hydraulic sizing rather than a dramatic flow reduction. This pairing appears most frequently in industrial process loops, municipal distribution systems, and commercial mechanical rooms where a 3" supply main transitions to a 2-1/2" sub-distribution run, equipment inlet, or branch circuit header sized precisely between the more common 2" and 3" diameters. The 2-1/2" outlet is a deliberate specification in these contexts — not a rounding compromise — and having the correct one-step reducer available in Schedule 80 gray PVC ensures compatibility with existing 2-1/2" infrastructure without introducing additional reducers or adapters downstream.

Both the 3" and 2-1/2" nominal sizes warrant a brief stocking note: while 3" is a standard and widely stocked pipe size, 2-1/2" sits in the less-common tier of the nominal pipe size sequence. Buyers sourcing this reducing coupling are typically working from a confirmed system specification where 2-1/2" has been deliberately selected, and the availability of the correct Schedule 80 reducer in this exact combination is often the critical procurement item for the project.

Manufactured from Type I, Grade I PVC compound, this fitting conforms to ASTM D2467 dimensional standards and delivers the wall thickness and pressure ratings that define Schedule 80 over Schedule 40. Compatible with Schedule 80 PVC pipe and solvent cements conforming to ASTM D2564.

Specifications:

Industries & Applications:

• Industrial & Chemical Processing — Inline reductions from 3" chemical-resistant pressure mains to 2-1/2" sub-distribution runs, equipment inlets, or secondary circuit headers where a one-step size transition is required without additional fitting complexity
• Municipal Water & Wastewater — Distribution system size transitions from 3" mains to 2-1/2" service laterals, metering connections, or equipment interfaces in treatment and distribution infrastructure
• Commercial Plumbing — Mechanical room and equipment room pipe size transitions on Schedule 80 systems where a 3" supply steps down to a 2-1/2" equipment inlet, branch header, or zone feed
• Irrigation — Pump station and mainline size reductions on pressurized irrigation systems where a 3" supply main transitions to a 2-1/2" lateral or equipment connection at zone entry points
• Mining & Oil Field — Corrosive fluid handling systems requiring a compact, durable inline size reduction between 3" and 2-1/2" pressure pipe on chemical-resistant PVC infrastructure
• Power Generation & Utilities — Cooling water and process fluid systems where a 3" supply main steps down to a 2-1/2" distribution run or equipment connection at headers and tie-in points
• Retrofit & System Integration — Transition fittings on systems where existing 3" Schedule 80 infrastructure must connect to 2-1/2" equipment, valves, or pipe sections without intermediate adapter assemblies