Reducing Tee, Slip x Slip x Slip PVC Schedule 40 5" x 5" x 4" (401-490)

The 5" x 5" x 4" PVC Schedule 40 Reducing Tee (Part No. 401-490) is a large-diameter, white-body fitting designed to introduce a 4" branch connection off a 5" Schedule 40 PVC main line. The two run ports maintain the full 5" bore for straight-through flow continuity, while the branch port steps down to 4" — all three ports accepting solvent-cement joints in a slip (socket) configuration, producing a rigid, leak-resistant assembly suited to the high-volume flow applications where large-diameter Schedule 40 PVC is the specified material.

The one-step branch reduction from 5" to 4" is the defining characteristic of this tee. The 4" branch carries meaningful flow capacity — only one nominal size smaller than the 5" run — making this fitting the appropriate specification wherever the branch circuit requires substantial throughput but not the full diameter of the main line. This configuration is common at system branch points where a 5" trunk or header feeds a 4" distribution run, zone sub-header, or lateral circuit, allowing the main line to continue at full 5" capacity through the run while delivering a high-flow 4" branch at the junction.

At this diameter, the reducing tee delivers a meaningful installation efficiency advantage over alternative approaches. Pairing a same-size 5" tee with a downstream 5" × 4" reducer on the branch would accomplish the same size transition, but the reducing tee consolidates both functions into a single fitting — reducing installed length on the branch outlet, eliminating one solvent-cement joint, and simplifying the overall assembly at a junction point where each fitting represents a significant material and labor investment.

5" Schedule 40 PVC fittings occupy a less-common tier of the nominal pipe size sequence, sitting between the far more universally stocked 4" and 6" diameters. Buyers sourcing this specific size combination — 5" run, 4" branch — are almost always working from a confirmed project specification where 5" has been deliberately selected as the main line diameter, and the availability of the correct reducing tee in a single fitting is often the critical procurement item for the installation.

Manufactured from Type I, Grade I PVC compound, this fitting conforms to ASTM D2466 dimensional standards and is compatible with Schedule 40 PVC pipe and solvent cements meeting ASTM D2564.

Specifications:

Industries & Applications:

• Municipal Water Distribution — Branch connections off 5" distribution mains to 4" service laterals, zone sub-headers, and system branch points where high branch flow capacity is required alongside full run continuity
• Large-Scale Irrigation — Three-way distribution points on 5" agricultural and landscape irrigation mains where a 4" branch supplies a zone header, lateral run, or sub-distribution manifold at near-full flow capacity
• Industrial Process Water — Branch feed connections on 5" process water and cooling water systems where a 4" circuit must be tapped off the main run without reducing the run diameter or introducing a multi-fitting branch assembly
• Stormwater & Site Drainage — Three-way junction points on large-diameter stormwater conveyance systems where a 4" branch conveyance line must be introduced off a 5" main collection or discharge run
• Water & Wastewater Treatment — Distribution and collection system branch points on 5" PVC plant infrastructure where a 4" branch circuit supplies treatment process connections, recirculation loops, or effluent distribution headers
• Commercial & Institutional Construction — Large-site utility and fire suppression system branch points on 5" PVC mains where a 4" branch feeds zone entries, building service connections, or system sub-headers
• Retrofit & System Expansion — Branch junction fittings on existing 5" Schedule 40 PVC infrastructure where a new 4" circuit must be introduced at a system branch point without upsizing or replacing the existing main line