Reducing Tee, Slip x Slip x Slip PVC Schedule 80 4" x 4" x 3" (801-422)

The 4" x 4" x 3" PVC Schedule 80 Reducing Tee (Part No. 801-422) is a pressure-rated, gray-body fitting designed to introduce a 3" branch connection off a 4" Schedule 80 PVC main line. The two run ports maintain the full 4" bore for straight-through flow continuity, while the branch port steps down to 3" — all three ports accepting solvent-cement joints in a slip (socket) configuration, producing a rigid, leak-resistant assembly suited to the elevated pressures and chemically demanding environments where Schedule 80 is the specified standard.

The one-step branch reduction from 4" to 3" is the defining characteristic of this tee. The 3" branch carries substantial flow capacity — only one nominal size below the 4" run — making this fitting the appropriate specification wherever the branch circuit requires high throughput but not the full diameter of the main line. This configuration is common at system branch points where a 4" pressure main feeds a 3" distribution run, equipment supply header, or zone sub-distribution circuit, allowing the main line to continue at full 4" capacity through the run while delivering a meaningful 3" branch flow at the junction point.

The one-step reduction makes this tee a natural pairing with a broad range of 3" Schedule 80 downstream components — valves, unions, flanged connections, and additional fittings — without requiring further reduction on the branch side. In industrial process systems, chemical processing loops, and municipal infrastructure where Schedule 80 is specified throughout, this reducing tee is frequently the junction fitting that bridges a 4" header or supply main to the 3" secondary circuits and equipment connections that make up the next tier of the distribution system.

Consolidating the branch connection and size reduction into a single fitting provides a meaningful installation advantage over pairing a same-size 4" tee with a downstream 4" × 3" reducer or bushing on the branch outlet. At Schedule 80 pressure ratings, every solvent-cement joint represents both a quality assurance step and a potential system vulnerability — minimizing joint count through single-component reducing fittings is a recognized best practice in pressure system assembly, and the 801-422 delivers that efficiency in one of the most common size combinations in the 4" Schedule 80 reducing tee lineup.

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 — Branch connections from 4" chemical-resistant pressure mains to 3" secondary distribution circuits, equipment supply headers, and process loop feeds where high branch flow capacity is required under Schedule 80 pressure ratings
• Municipal Water & Wastewater — Junction fittings on 4" distribution or collection mains where a 3" service lateral, metering connection, or treatment equipment supply must be introduced without reducing the primary run diameter
• Commercial Plumbing — Mechanical room and equipment room branch connections on Schedule 80 systems where a 4" supply main steps down to a 3" equipment inlet, zone header, or secondary circuit at a single junction point
• Irrigation — Branch connections on pressurized 4" irrigation mains where a 3" zone header, lateral feed, or pump supply line must be tapped off the main run at a high-flow branch point
• Mining & Oil Field — Corrosive fluid handling systems requiring a durable, chemical-resistant one-step branch reduction from a 4" pressure main to a 3" secondary circuit or equipment supply connection
• Power Generation & Utilities — Cooling water and process fluid systems where a 4" supply main branches to a 3" distribution run or equipment connection at pump headers, heat exchanger supply points, or system manifold locations
• Aquaculture & Water Treatment — Recirculating system headers and distribution manifolds where a 4" main branches to a 3" lateral supply circuit serving filter banks, aeration equipment, or treatment process connections