Wye, Slip x Slip x Slip PVC Schedule 80 4" (875-040)

The 4" PVC Schedule 80 Slip x Slip x Slip Wye (Part No. 875-040) is a heavy-duty, equal-outlet three-port branch fitting that maintains a full 4-inch bore through all three ports — run inlet, run outlet, and branch — joined at a 45-degree angle and built to the increased wall thickness, higher pressure capacity, and superior mechanical resilience that define Schedule 80 construction. All three ports are slip (socket) end, accepting 4-inch PVC pipe or spigot fittings via solvent-weld connection for a permanent, high-integrity joint across all three legs of the system.

The equal-outlet configuration is the defining characteristic of this fitting and the feature that sets it apart from the reducing wye variants in the 875 series. Where the 4" x 3" (875-422) and 4" x 4" x 2" (875-420) variants step the branch outlet down to a smaller-diameter lateral or service connection, the 875-040 maintains full 4-inch bore through the branch — making it the correct specification when the system requires equal flow capacity available through both the mainline continuation and the branch simultaneously. This is the fitting for systems where the branch is not a service tap, drain stub, or controlled-access point, but a full-capacity flow path — a parallel circuit feed, a zone distribution branch, a process sub-system inlet, or a gravity-flow drainage lateral — where restricting the branch to a smaller diameter would create an unacceptable flow bottleneck in the branch leg of the system.

The 45-degree branch geometry is the hydraulic foundation that makes the wye the preferred branch fitting over a standard tee in a wide range of applications, and at equal outlet sizes this advantage is most directly meaningful. A standard equal tee redirects branch flow perpendicular to mainline travel — a 90-degree momentum change that generates turbulence, increases head loss at the junction, and in gravity-flow drainage systems creates conditions favorable to solids deposition and blockage at the branch point. The 875-040's 45-degree branch angle eases branch flow in the direction of mainline travel, producing a smoother, lower-turbulence transition that reduces head loss through the branch junction, improves self-cleaning flow characteristics in drain and sewer applications, and better preserves hydraulic balance across distribution networks with multiple equal branch points. In sanitary sewer, industrial drainage, and process drain systems, the 45-degree equal wye is frequently the fitting specified by design standards and experienced engineers for lateral connections precisely because the 90-degree tee alternative introduces a level of turbulence and solids accumulation risk that the wye geometry avoids.

Specifying this fitting in Schedule 80 rather than Schedule 40 is a deliberate engineering decision — one driven by service conditions that exceed the reliable performance envelope of Schedule 40 at 4-inch diameter. Whether the driver is elevated operating pressure, chemical fluid service that benefits from the greater structural mass of Schedule 80, mechanical loading or impact resistance requirements at an exposed branch junction, or a system-wide Schedule 80 specification in a high-criticality process or industrial installation, the thicker PVC wall of Schedule 80 delivers a higher pressure rating than Schedule 40 at equivalent diameters, greater resistance to impact and external mechanical stress, and improved structural integrity under thermal cycling and continuous-duty industrial service conditions that a Schedule 40 equal wye at this size could not reliably sustain over the intended service life of the system.

Manufactured from virgin PVC compound to ASTM D2467 standards and gray in color per Schedule 80 convention, this wye is NSF/ANSI 61 certified for potable water contact — qualifying it for municipal water distribution, water treatment infrastructure, and food-adjacent process piping in addition to its core industrial, chemical, and wastewater applications. Compatible with IPS-standard PVC solvent cements and primers for a code-compliant, permanent installation.

Specifications:

Note: Schedule 80 pressure ratings exceed Schedule 40 at equivalent diameters due to increased wall thickness. Always consult manufacturer-published pressure-temperature rating tables for the specific size and service conditions before system design.

Industries & Applications:

• Industrial Process Piping — The core Schedule 80 application for an equal wye at this size; used at full-bore branch junctions in chemical plants, pharmaceutical facilities, refineries, and heavy manufacturing environments where a 4-inch process header must split to a parallel 4-inch sub-process feed, recirculation circuit, or equipment distribution branch under operating pressures or chemical service conditions that require Schedule 80 construction at every branch fitting in the system
• Chemical Handling Systems — The equal outlet configuration preserves full flow capacity through the branch in chemical transfer, recirculation, and distribution applications where restricting the branch to a smaller diameter would impair dosing accuracy, transfer rate, or system balance; Schedule 80 wall thickness provides the additional structural integrity required in aggressive chemical service environments; always verify chemical compatibility with the specific fluid and concentration before specification
• Wastewater & Sanitary Sewer Systems — The 45-degree branch geometry aligns with sanitary sewer design standards for lateral connections in gravity-flow collection systems; the equal outlet ensures full 4-inch flow capacity through the branch leg for lateral service connections, cleanout assemblies, and collection manifold branches; the Schedule 80 specification extends this fitting into pressurized force main applications where pump discharge pressure at 4-inch diameter requires heavier-wall construction at the branch junction
• Industrial Drainage & Process Drain Systems — Used in chemical-resistant floor drain headers, equipment drain manifolds, and process drain collection networks where full-bore 4-inch branching is required at collection junctions in industrial facilities where corrosive drain fluids, elevated temperatures, or mechanical loading at the branch fitting justify Schedule 80 specification over standard Schedule 40 drainage fittings
• Municipal Water Distribution — Specified at full-bore branch junctions on 4-inch distribution mains in high-pressure service zones where the system designer requires the pressure margin and structural performance of Schedule 80 at the branch fitting, and where the equal-outlet wye geometry is preferred over a tee for its lower head loss contribution at the distribution branch point
• Water Treatment & Filtration Plants — Integrates into 4-inch process piping headers and treatment train distribution systems at full-bore branch junctions where the equal wye geometry minimizes turbulence and head loss through the branch transition in plant environments where Schedule 80 is specified system-wide for pressure capacity, chemical resistance, or long-term reliability
• High-Pressure Irrigation & Pump Stations — Specified on pump discharge manifolds and pressurized mainline laterals in commercial and large-scale agricultural irrigation systems where operating pressures at 4-inch diameter exceed Schedule 40 design limits and where the equal wye provides a full-bore 45-degree branch for zone distribution, parallel circuit feeds, or manifold splitting applications
• Aquaculture & Recirculating Systems — Used in RAS distribution manifolds and tank supply networks where a 4-inch header must split to two full-bore 4-inch distribution legs in a continuous-duty facility environment where Schedule 80 is specified for long-term joint integrity and the equal-outlet wye geometry supports balanced flow distribution across parallel tank supply circuits