Reducing Tee, Slip x Slip x Slip PVC Schedule 40 4" x 4" x 1-1/2" (401-419)

The 401-419 is a PVC Schedule 40 reducing tee with a 4" slip (socket) run and a 1-1/2" slip (socket) branch outlet, all joined by solvent cement welding per ASTM D2564. The two 4" run ports accept standard 4" PVC pipe ends for a permanent, pressure-rated inline connection, while the 1-1/2" slip branch accepts a standard 1-1/2" PVC pipe end — creating a fully solvent-welded, three-way reducing junction with no threaded connections at any port.

Manufactured from rigid PVC compound conforming to ASTM D1784 cell classification requirements, this fitting delivers the corrosion resistance, chemical compatibility, and long service life associated with Schedule 40 PVC across a wide range of commercial, industrial, and municipal piping systems. The Schedule 40 wall thickness provides reliable pressure-rated performance for both pressurized distribution systems and gravity-flow applications.

The 401-419 is the all-slip counterpart to the 402-419 (4" x 4" x 1-1/2" FPT branch) and holds a well-defined position at the upper end of the small-to-mid branch range in the 4" all-slip reducing tee series. The 1-1/2" branch is one of the most common pipe sizes in commercial and industrial plumbing — supporting a wide range of valve bodies, strainer assemblies, pump connections, and inline equipment — and at this size the branch carries genuine moderate-to-high flow capacity as a primary zone circuit or dedicated secondary supply line rather than a service tap or instrument connection. This positions the 401-419 directly below the near-primary-flow 3" branch of the 401-422 and the secondary circuit 2" branch of the 401-420, serving installations where the downstream 1-1/2" circuit is a meaningful, sustained-flow branch rather than an occasional or low-volume tap. All three ports are permanent solvent-welded connections — the characteristic that governs the application context of this fitting entirely. The 401-419 is the correct choice when the 1-1/2" branch is a designed-in, fixed system element that will never require disconnection or reconfiguration: a permanent zone circuit supply, a fixed bypass assembly, a long-term dedicated equipment feed, or any 1-1/2" branch that is integral to the distribution layout by design. At the 1-1/2" branch size, downstream connected elements — zone valves, pump connections, strainer assemblies, inline meters — are substantial fittings with well-established replacement and maintenance cycles in most commercial and industrial systems. The permanent nature of the all-slip branch joint must be a deliberate design decision rather than an inadvertent default. Buyers who anticipate any future need to service, remove, or reconfigure the 1-1/2" branch connection should select the 402-419 (FPT branch) instead, which provides an identical 4" slip run with a threaded 1-1/2" outlet that remains fully serviceable throughout the system's life.

Specifications:

Industries & Applications:

• Irrigation & Agriculture — Permanent 1-1/2" branch connections off 4" mainline headers for fixed primary zone circuit supply lines, dedicated lateral headers, and permanent bypass assemblies in large-scale pressurized irrigation systems where the branch is a designed-in long-term installation carrying sustained moderate-to-high flow volume
• Municipal Water & Wastewater — Permanent moderate-to-high flow service branches and fixed secondary supply connections off 4" distribution mains at pump stations and treatment facilities where a 1-1/2" all-solvent-weld branch is a permanent system element with no future serviceability requirement at the branch joint
• Industrial Process Piping — Permanent 1-1/2" branch connections off 4" process fluid and cooling water mainlines for fixed bypass circuits, dedicated secondary distribution lines, permanent chemical feed assemblies, and designed-in service branches in fully solvent-welded industrial piping systems
• HVAC & Mechanical — Permanent 1-1/2" branch connections off 4" chilled water and condenser water mainlines for fixed zone circuit feeds, dedicated equipment supply lines, and permanent bypass assemblies in commercial mechanical rooms where all-slip PVC construction is specified throughout the system
• Commercial Plumbing — Permanent moderate-to-high flow branch connections off 4" distribution headers for fixed primary zone supply lines, dedicated equipment feeds, and permanent secondary service circuits where the 1-1/2" branch is a designed-in system element with no future removal or reconfiguration requirement
• Fire Suppression — Permanent auxiliary drain assemblies, fixed primary branch circuit feeds, and dedicated riser supply connections off 4" sprinkler system mains where a 1-1/2" all-solvent-welded branch is specified as a permanent element of a fully bonded fire suppression installation