Reduced Wye Socket, PVC Schedule 40 4" x 2" (475-420)

The 4" x 2" PVC Schedule 40 Reduced Wye Socket is a three-port fitting designed to introduce a compact lateral branch into a 4-inch piping run at a 45-degree angle. With 4-inch slip socket connections on both run ends and a 2-inch slip socket on the branch outlet, this fitting installs permanently via PVC solvent cement on all three connections — creating a pressure-tight, structurally integral assembly at the branch junction point.

The 475-420 is the smaller-branch companion to the previously described 475-421 (4" x 2-1/2" reduced wye), and together they complete a two-size branch range for the 4-inch run wye series. The 2-inch branch represents a more pronounced size differential than the 2-1/2-inch version — a full two nominal pipe sizes below the 4-inch run — which narrows the branch's functional role accordingly. Where the 2-1/2-inch branch can serve as a moderate-capacity fixture lateral or secondary drain connection, the 2-inch branch is more characteristic of individual fixture connections, single-appliance drains, cleanout access points, and low-volume secondary laterals that generate limited flow relative to the 4-inch primary run.

The wye geometry remains the defining specification advantage over a tee at this branch point regardless of branch size. The 45-degree lateral angle directs the entering or departing 2-inch branch flow at a shallow, gradual merge with the 4-inch run — preserving flow momentum in the main, reducing turbulence at the junction, and minimizing the risk of solids accumulation that a perpendicular tee connection would introduce at the same location. In gravity drainage and DWV systems, where the entire system relies on slope and flow velocity to convey waste without mechanical assistance, protecting that velocity through fitting transitions is a core design principle — and the wye is the fitting that embodies that principle at every branch connection point where layout permits its use.

At the 4" x 2" size combination, this fitting appears most frequently in building drain systems receiving individual fixture connections, in floor drain lateral networks connecting single-drain points to a 4-inch collection main, and in cleanout branch assemblies where a 2-inch access point is introduced into the main drain run at a designed service location. In each of these cases, the 45-degree wye geometry serves the same purpose: connecting a smaller lateral to a larger main at an angle that keeps the drainage system functioning smoothly through the junction. All three slip socket connections are designed for permanent solvent cement installation. Manufactured to ASTM D2466 standards and compatible with Schedule 40 PVC pipe in both 4-inch and 2-inch sizes.

Specifications:

Industries & Applications:

• Drain, Waste & Vent (DWV) Systems — The primary application; used in building drain assemblies where an individual fixture drain, appliance connection, or single-point 2-inch lateral joins a 4-inch building drain main — the 45-degree wye geometry maintaining gravity flow momentum through the junction and reducing the turbulence and blockage risk that a 90-degree tee connection would introduce at the same point in the drainage network
• Commercial & Institutional Plumbing — Specified in large commercial building drain systems where 4-inch main drain runs receive 2-inch branch connections from individual floor drains, lavatories, service sinks, drinking fountain drains, or equipment condensate lines at lateral junction points distributed throughout the drainage network
• Stormwater & Site Drainage — Applied in site utility plans and underground stormwater drainage systems where a 2-inch secondary drainage lateral — a single catch basin outlet, a roof drain downspout connection, or a small area drain — connects to a 4-inch collection main at a wye junction, directing the lateral inflow into the main run at a smooth, low-turbulence angle
• Industrial Facility Drainage — Incorporated in industrial floor drain systems and equipment wash-down drainage networks where individual 2-inch floor drain connections join a 4-inch collection header at wye junctions distributed across the facility floor — the 45-degree wye geometry reducing solids accumulation at each junction in systems where drainage frequently carries particulates, wash water, or light process residues
• Cleanout & Maintenance Access — Specified at designed cleanout points along 4-inch drain mains where a 2-inch wye branch provides angled access for drain maintenance equipment — the 45-degree geometry directing a drain snake, jetting nozzle, or inspection camera smoothly into the upstream flow path, providing better upstream reach and more effective clearance than a perpendicular tee cleanout fitting would allow
• Irrigation & Agricultural Drainage — Used in field tile drainage systems and agricultural drainage networks where individual 2-inch field tile laterals connect to a 4-inch collection main at wye junctions — the angled connection directing lateral drainage flow into the collection main efficiently while minimizing the sedimentation and root intrusion risk at the junction that a perpendicular tee connection would be more susceptible to in below-grade agricultural drainage applications