Reduced Wye, Socket PVC Schedule 40 3" x 1-1/2" (475-337)

The 3" x 1-1/2" PVC Schedule 40 Reduced Wye (Socket) provides a smooth, angled branch connection off a 3" solvent-welded drain or gravity-flow run, accepting a 1-1/2" pipe at the branch port. The wye geometry orients the branch at approximately 45 degrees to the main run, allowing flow from the smaller-diameter branch to merge with the primary drain line in a gradual, low-turbulence transition — preserving drainage velocity, supporting solids conveyance, and reducing the risk of accumulation at the junction that a sharper 90-degree branch geometry would introduce.

The 3" to 1-1/2" size differential makes this a fitting well-suited for collecting flow from individual fixtures, floor drains, equipment drain pans, and small-diameter secondary drain lines into a larger 3" main drain run. A 1-1/2" branch is one of the most common fixture drain sizes in commercial and institutional plumbing — sinks, lavatories, dishwashers, ice makers, HVAC condensate lines, and equipment drains frequently terminate at 1-1/2" — making this reduced wye a practical and frequently specified fitting wherever individual fixture drains must enter a 3" collection main at a code-compliant angle.

All socket ends accept PVC pipe via solvent cement, creating permanent, leak-free joints throughout the assembly. Wye fittings are the preferred branch fitting in gravity DWV system design for horizontal-to-horizontal drain branches, and many plumbing codes specifically require or recommend the wye configuration over a sanitary tee in horizontal drain applications because the 45-degree entry angle supports self-scouring flow velocities and minimizes dead zones where solids and debris can settle over time.

Manufactured to ASTM D2665 standards and listed under NSF/ANSI 14, the 475-337 is molded from white Schedule 40 PVC, appropriate for above-ground and underground DWV applications across a broad range of commercial, institutional, and industrial drain system configurations.

Specifications:

Industries & Applications:

• Commercial Plumbing & DWV Systems — The dominant application at this size combination; installed in 3" horizontal drain mains in commercial buildings, restaurants, hotels, schools, and healthcare facilities where individual 1-1/2" fixture drains — sinks, lavatories, dishwashers, ice machines, and equipment drains — must connect to the collection main at a code-compliant 45-degree entry angle
• Food & Beverage Processing — Used in facility drain systems collecting 1-1/2" equipment and fixture drains — prep sink drains, ice maker lines, beverage equipment waste, and floor drain branches — into 3" main drain runs where hygiene, flow-through efficiency, and minimal solids accumulation are operational priorities
• Healthcare & Institutional Facilities — Installed in sanitary drain systems in hospitals, clinics, schools, and government buildings where plumbing codes specify wye fittings for horizontal drain branches and a 1-1/2" fixture or equipment drain must connect to a 3" collection main
• HVAC & Mechanical Systems — Applied in condensate drain collection systems where multiple 1-1/2" HVAC unit drain lines consolidate into a 3" main condensate or floor drain run; the wye geometry minimizes backflow risk and supports gravity drainage across large multi-unit mechanical systems
• Industrial Process Drainage — Used in plant floor drain networks, equipment drain pan collection systems, and process wastewater infrastructure where 1-1/2" equipment drains must enter a 3" gravity drain main with minimal turbulence and reliable long-term solids conveyance
• Municipal & Civil Drainage — Applied in gravity sewer laterals and site drainage systems where a 1-1/2" secondary drain or service lateral must connect to a 3" collection main at a low-turbulence angle to maintain solids-carrying capacity through the junction point