Reducing Tee, Slip x Slip x Slip PVC Schedule 40 3" x 3" x 1" (401-335)

The 401-335 is a 3" x 3" x 1" Schedule 40 PVC reducing tee with slip (socket) connections on all three ports. Both run ends are 3 inches and the branch outlet is 1 inch — a two nominal step reduction at the branch. All three ports are solvent weld sockets with no threaded interfaces on any port, making every joint in the assembly permanent once cemented. Within the 401-series 3-inch run sub-group, the 401-335 carries the highest-capacity reduced branch — the 1-inch bore is two nominal steps below the mainline and delivers meaningfully greater flow capacity than the 3/4-inch branch of the 401-334, producing a branch suited for primary secondary distribution headers, major bypass connections, and high-throughput equipment supply lines where the downstream branch is a permanently routed, fixed-installation pipe run.

The distinction between the 401-335 and the 402-335 is the same foundational architectural decision that runs through every paired entry across the 401 and 402-series in this catalog. The 402-335 — a 3" x 3" x 1" Schedule 40 reducing tee with a Slip x Slip x FPT mixed connection — provides a female NPT threaded 1-inch branch that can receive and release threaded valves, equipment connections, and fittings as often as needed over the system's service life without disturbing the solvent welded run. The 401-335 provides the same 1-inch branch bore in a permanent all-slip socket configuration that is cemented exactly like both run ends — structurally integral to the pipe assembly, with no provision for independent branch disassembly without cutting pipe.

The selection between the two is determined by a single question: is the 1-inch branch a permanently routed pipe run, or does it serve a connection that must be broken and remade? When the branch continues as a fixed solvent weld pipe run connecting to downstream distribution piping, a fixed piece of equipment with a solvent weld inlet, or any other permanently routed pipe continuation — the 401-335's all-slip branch is the correct configuration, producing a fully consistent solvent weld assembly across all three ports with no threaded interface breaking the all-PVC construction at the branch position. When the branch must connect to a threaded valve, a removable equipment connection, or any fitting that requires periodic access without cutting pipe — the 402-335 and its FPT branch is the appropriate fitting.

At 1-inch bore, the 401-335 branch carries substantially more flow than the 3/4-inch branch of the 401-334. This capacity difference is meaningful at the application level: a 3/4-inch branch feeds zone sub-mains, single equipment supply lines, and modest secondary flows; a 1-inch branch feeds primary zone distribution mains, major equipment supply runs, and high-volume bypass or recirculation connections. Buyers who find the 401-334's 3/4-inch branch undersized for their permanently routed secondary line flow demand will find the 401-335's 1-inch branch is the next available step up in the all-slip sub-group.

Both 3-inch run ends require heavy-bodied PVC solvent cement applied thoroughly and quickly to both the pipe end and socket bore. Pipe should be seated immediately with a quarter-turn rotation to distribute cement evenly, then held firmly for 30 seconds. Allow a full 24-hour cure before pressurizing the system. The 1-inch branch socket follows standard Schedule 40 PVC cement procedures — primer and standard or medium-bodied cement are appropriate at this bore size. All three sockets must be individually primed and cemented; confirm branch orientation before any joint sets, as all three are fixed once cured.

This fitting is manufactured from virgin PVC compound conforming to ASTM D1784 Cell Classification 12454 and dimensioned to ASTM D2466 standards for Schedule 40 PVC socket fittings.

Specifications:

Pressure rating is for water service at 73°F. Assembly pressure rating is governed by the lower-rated 3-inch run ends at 160 PSI. The 1-inch branch end in isolation rates at 450 PSI but does not govern the assembled fitting rating. Derate for elevated temperatures per manufacturer guidelines. Use heavy-bodied PVC solvent cement for 3-inch socket joints; standard or medium-bodied cement is appropriate for the 1-inch branch socket. All three socket joints are permanent once cemented — confirm branch orientation before cement sets. Buyers requiring a serviceable or reconnectable 1-inch branch port should specify the 402-335 (Slip x Slip x FPT) rather than this all-slip fitting.

Industries & Applications:

The 401-335 Schedule 40 reducing tee serves residential, commercial, and light industrial piping applications wherever a 3-inch Schedule 40 PVC mainline requires a permanent all-solvent-weld high-capacity 1-inch branch for primary secondary distribution, major zone supply, or high-throughput equipment connections in systems where the branch joint is a fixed permanently routed installation:

• Irrigation & Agricultural Distribution — Permanent high-capacity branch connections on 3-inch irrigation supply headers where a 1-inch all-slip branch feeds permanently routed primary zone distribution mains, large-volume sub-header runs, and high-flow filter station supply lines in field distribution networks where all connections are permanent solvent weld joints and the branch flow demand exceeds what a 3/4-inch branch can reliably deliver
• Municipal & Commercial Plumbing — Permanent near-full-bore reducing branches on 3-inch Schedule 40 utility water mains and mechanical room headers where a 1-inch all-slip branch supplies major secondary distribution mains, primary fixture group supply runs, and high-capacity equipment connections as fixed permanent joints in all-solvent-weld system buildouts where Schedule 40 pressure ratings are specified throughout
• Stormwater & Drainage Infrastructure — Permanent high-capacity branch connections on 3-inch Schedule 40 stormwater conveyance and drainage systems where a 1-inch all-slip branch provides permanently cemented secondary drainage outlets, overflow relief connections, and high-flow drainage sub-runs in buried or surface drainage networks built with all-solvent-weld construction throughout
• Swimming Pool & Aquatic Facility Plumbing — Permanent high-capacity branch connections on 3-inch pool and spa recirculation mains where a 1-inch all-slip branch supplies permanently routed heater bypass connections, major equipment supply runs, and high-flow chemical treatment branch feeds in equipment room piping layouts where all-solvent-weld construction is consistent with the permanent nature of the equipment room pipe assembly
• Chemical Processing & Water Treatment — Permanent all-slip high-capacity three-way flow distribution on 3-inch chemical distribution and process water headers where a 1-inch branch feeds permanently routed major secondary treatment loops, high-volume chemical equipment connections, and primary bypass assemblies in systems where all-solvent-weld construction is specified for joint strength and chemical resistance throughout
• Industrial Process & Utility Piping — Permanent high-capacity reducing branch connections on 3-inch process water, cooling water, and utility supply headers where a 1-inch all-slip branch supplies primary secondary process distribution lines, major equipment supply connections, and high-flow bypass feeds at fixed three-way junction points in permanently built-out all-solvent-weld industrial systems
• HVAC & Cooling Systems — Permanent high-capacity branch connections on 3-inch condenser water and chilled water distribution headers where a 1-inch all-slip branch supplies major bypass loops, primary treatment equipment connections, and high-flow secondary distribution lines as fixed all-solvent-weld junctions in mechanical room installations where the permanent pipe assembly is built entirely from solvent weld fittings with no threaded interfaces at tee locations