Wye, Slip x Slip x Slip, PVC Schedule 80 3" x 1-1/4" (875-336)

The 875-336 is a 3" x 1-1/4" Schedule 80 PVC reducing wye with slip socket connections on all three outlets. The fitting carries a 3" solvent-weld main run while introducing a 1-1/4" reduced branch at a 45° angle — the geometry that defines the wye fitting type, satisfies horizontal drain line branch connection code requirements, and delivers superior hydraulic performance at the junction compared to a standard 90° tee in drain, waste, and vent (DWV) applications, gravity-flow drainage systems, and industrial process piping where smooth, low-turbulence flow transition at branch points is a design and code priority.

The 875-336 carries the smallest branch outlet in the 3" Schedule 80 reducing wye series, stepping down from a 3" run to a 1-1/4" branch — a full 1-3/4" nominal reduction. This is a deliberate, application-specific size pairing. The 1-1/4" branch is not a general-purpose lateral; it is sized for low-flow secondary connections where a small but fully rated Schedule 80 branch socket is required at a 45° entry angle rather than the abrupt 90° geometry of a tee. Typical uses include small equipment drain ports, individual fixture drain connections, condensate discharge lines, chemical injection return taps, and low-volume sampling or monitoring branch connections on a 3" industrial waste, chemical drain, or process piping header.

The 1-1/4" nominal size itself signals the fitting's application context. While common in residential plumbing, 1-1/4" appears in industrial and chemical process systems specifically at low-flow equipment drain and instrument connection points — almost always in Schedule 80 when the parent system is Schedule 80. Pairing it with a 3" Schedule 80 wye run confirms this fitting's role at the intersection of a heavy-duty industrial primary line and a small, low-flow secondary branch that still demands Schedule 80 chemical resistance, pressure rating, and mechanical durability throughout the connection.

The 45° branch entry preserves directional flow momentum through the junction, reduces turbulence and head loss at the branch point, and supports self-cleaning flow characteristics that a 90° tee branch cannot provide — a meaningful performance distinction in chemical drain, industrial waste, and process effluent systems where solids, particulates, or viscous media are present and accumulation at branch junctions creates blockage and maintenance risk.

All three slip sockets accept standard IPS-dimension Schedule 80 PVC pipe bonded with IPS-approved PVC solvent cement. Manufactured from rigid dark gray PVC compound to ASTM D2467, the 875-336 delivers the full Schedule 80 performance profile: heavier walls, higher pressure ratings, superior chemical resistance across acids, bases, and industrial solvents, and greater impact and mechanical stress tolerance than Schedule 40 equivalents — confirming its specification role in industrial, chemical, laboratory, and demanding commercial service environments.

Specifications:

Industries & Applications:

• Industrial Drain, Waste & Vent (DWV) — Small equipment drain ports, individual fixture drain connections, and low-flow secondary lateral connections off 3" industrial drain headers where the 45° wye branch satisfies code requirements for horizontal drain line branch entries and Schedule 80 wall thickness handles chemical drain service and aggressive industrial effluents
• Chemical Processing & Manufacturing — Low-flow secondary branch taps on 3" chemical drain headers and process waste collection mains; the 1-1/4" branch accommodates individual equipment drain connections, chemical feed discharge lines, small vessel drain ports, and low-volume waste return circuits where the 45° wye geometry reduces accumulation risk in chemical and particulate-laden effluent streams
• Laboratory & Research Facilities — Individual fixture and equipment drain branch connections in laboratory drain systems where 1-1/4" sink drains, equipment drain lines, or instrument waste connections tie into a 3" Schedule 80 waste collection header; Schedule 80 chemical resistance handles solvent waste, acid drain, and mixed laboratory effluent streams requiring corrosion-resistant fittings throughout
• Pharmaceutical & Biotech Facilities — Low-flow process drain and pure water system branch junctions where Schedule 80 PVC is specified for aggressive effluent handling and the 1-1/4" branch accommodates individual equipment drains, small vessel connections, or secondary waste circuits off a 3" primary drain or process line
• Semiconductor & Electronics Manufacturing — Chemical waste collection and ultra-pure water distribution branch junctions where Schedule 80 PVC is required for aggressive high-purity and corrosive media and the small-bore 1-1/4" branch connects individual process tools, rinse stations, or chemical drain points into a 3" Schedule 80 collection header
• Industrial Process Piping — Low-flow condensate returns, instrument drain taps, sampling port connections, and small equipment drain branches off 3" Schedule 80 process water, coolant, and utility fluid headers where Schedule 80 construction meets industrial service requirements and the wye geometry supports clean hydraulic transition at the branch point
• Pulp, Paper & Food Processing — Individual equipment drain, condensate discharge, and low-flow washdown return branch connections on 3" waste collection and drain headers handling dilute chemicals, caustic solutions, steam condensate, and food-safe process effluents in facilities where Schedule 80 chemical resistance is a specification requirement
• HVAC & Mechanical Systems — Condensate drain and small-bore return branch connections on 3" Schedule 80 mechanical system drain headers in industrial and commercial facilities where corrosion-resistant heavy-wall fittings are specified for chemical resistance, pressure rating, and long-term service reliability in demanding mechanical environments