Wye, Slip x Slip x Slip PVC Schedule 40 4" x 4" x 3" (475-422)

The 4" x 4" x 3" PVC Schedule 40 Reducing Wye (475-422) is engineered for drainage and waste piping systems where a 3" branch line must merge into or divert from a 4" main line with minimal flow disruption. Unlike a standard tee, the wye's 45° branch angle promotes smoother, more consistent flow transitions — reducing turbulence, limiting solids accumulation, and improving overall system performance in gravity-fed drain, waste, and vent (DWV) configurations.

All three ports use slip connections for solvent-welded joints, creating a permanent, leak-resistant assembly suited to both above-ground and below-grade drainage installations. Manufactured from rigid PVC to Schedule 40 specifications and dimensionally compliant with ASTM D2466, this fitting integrates cleanly with Schedule 40 pipe and fittings from all major manufacturers on both the 4" run and the 3" branch.

The reducing branch configuration — 3" into a 4" main — is a common design requirement in commercial and industrial drainage systems where multiple fixture groups, floor drains, or secondary waste lines tie into a larger primary drain header. The solvent-weld slip connections keep the installation straightforward and the joint count manageable across complex multi-branch drainage layouts.

Specifications:

Industries & Applications:

• Commercial Plumbing & DWV — branch connections in commercial drain, waste, and vent systems where smooth flow transition is required
• Industrial Drainage — process floor drain and equipment waste lines merging into larger primary drain headers
• Municipal & Civil — below-grade drainage laterals connecting to primary collection lines
• Food & Beverage Processing — sanitary waste and floor drain collection systems requiring reliable, low-turbulence flow paths
• Irrigation & Agriculture — gravity-fed drainage and runoff collection systems
• Hospitality & Institutional — multi-fixture group drain branches in hotels, hospitals, and large commercial facilities