Reducing Tee, Slip x Slip x Slip PVC Schedule 40 3" x 3" x 2-1/2" (401-339)

The 401-339 is a 3" x 3" x 2-1/2" PVC Schedule 40 reducing tee in an all-slip configuration, featuring 3" slip inlets on both run ends and a 2-1/2" slip branch outlet. With only a single pipe size separating the branch from the mainline, this is a near-full-bore reducing tee — the closest branch-to-run ratio available in the 401-series 3" run family short of a full-size 3" branch. It is the appropriate choice when the branch flow requirement approaches mainline capacity and a full-size 3" branch is not warranted or the downstream connection is specified at 2-1/2".

At this branch-to-run ratio, the 401-339 functions less like a conventional tap and more like a high-capacity flow divider — both the run and the branch carry substantial, sustained flow volumes simultaneously. This makes the fitting well-suited for parallel circuit splits, major bypass loops, high-volume secondary supply lines, and equipment feed branches where near-mainline flow capacity is required at the branch without stepping up to a full-size tee.

The all-slip design bonds all three ports permanently with solvent cement, producing a monolithic, leak-free assembly with no threaded joints to loosen, weep, or require periodic maintenance. In large-diameter piping at the 3" scale, the permanence of the solvent-weld joint is a particularly meaningful advantage — eliminating the mechanical joints and gasket interfaces that introduce potential failure points in high-flow, large-bore systems. This makes the 401-339 well-suited for buried infrastructure, enclosed mechanical spaces, and any large-diameter installation where long-term joint integrity is a priority.

Schedule 40 PVC provides the pressure ratings and chemical resistance appropriate for the broad range of commercial, industrial, and municipal applications this tee serves — at a cost-effective wall thickness well-suited for systems where the higher pressure ratings of Schedule 80 are not required. The white color is the standard identifier for Schedule 40 PVC, distinguishing it from gray Schedule 80 components in mixed systems.

Solvent cement installation follows standard PVC practice — clean, prime, and cement all mating surfaces per ASTM D2564 procedures. At 3" pipe sizes, ensure adequate working time by cementing one socket at a time and confirming full pipe seating before proceeding to the next joint. Proper alignment must be confirmed before the cement sets, as socket fits at this diameter leave limited adjustment time once bonded.

Specifications:

Industries & Applications:

The 401-339 is well-suited for Schedule 40 systems requiring a near-full-bore, permanent solvent-weld branch off a 3" mainline where the branch carries a major share of system flow:

• Irrigation & Agriculture — High-volume near-mainline-capacity lateral splits in large-scale pressurized irrigation systems where a 2-1/2" branch supplies a major zone header, secondary distribution manifold, or field block supply line off a 3" mainline
• Water & Wastewater Treatment — Near-full-bore branch connections in treatment plant distribution piping, pump station headers, and process water supply lines where a 2-1/2" branch carries substantial flow off a 3" mainline in a permanent solvent-weld installation
• Commercial & Industrial Plumbing — High-flow branch connections for major equipment circuits, primary bypass assemblies, and near-mainline secondary supply lines in large-diameter cold water and mechanical room piping at the 3" scale
• Municipal Water Distribution — Near-full-bore branch takeoffs in Schedule 40 PVC water distribution infrastructure where a 2-1/2" service or lateral line branches off a 3" supply main in a permanent buried installation
• Industrial Processing — Parallel circuit splits, major bypass loops, and high-capacity equipment feed branches off 3" process piping headers where near-mainline branch flow is required in a cost-effective Schedule 40 assembly
• Aquaculture & Aquatics — High-volume parallel circuit splits and major secondary flow connections off 3" recirculating system headers, including primary filter return lines, pump bypass circuits, and main distribution branches in large-scale systems
• HVAC & Cooling Systems — Near-full-bore branch takeoffs in large-diameter chilled water and process cooling distribution circuits where the secondary loop demands close to mainline flow capacity off a 3" header
• Fire Suppression Support Systems — Branch connections in Schedule 40 PVC water supply and distribution lines feeding fire suppression support infrastructure where large-diameter near-full-bore flow is required at the branch point