Westlake Pipe Fittings P158-4 Pvc Sanitary Tee SDR-35

Product Description

The WESTLAKE PIPE FITTINGS P158-4 is an 8 x 4 inch SDR-35 PVC sanitary tee designed for gravity-flow drainage, waste, and vent (DWV) systems. This fitting uses solvent weld connections to create a permanent, leak-resistant joint at both the main run and the 4-inch branch outlet. Built to SDR-35 dimensional standards, it is suited for underground and below-grade sewer applications where consistent wall thickness and flow performance are required. Licensed plumbers and sewer contractors install this type of fitting during new construction and lateral connection work on residential and light commercial sewer lines.

This sanitary tee is used in gravity-fed sewer and drain systems where a branch connection must be introduced into a larger main line. The swept inlet design promotes smooth flow transition from the 4-inch branch into the 8-inch main, reducing the risk of solids buildup at the junction. Typical applications include residential sewer laterals, commercial underground drainage systems, and municipal-adjacent service connections where SDR-35 PVC pipe is specified.

Key Features

• SDR-35 wall construction meets standard dimensional ratio requirements for sewer and drain service
• Solvent weld socket connections provide a permanent, watertight joint compatible with standard PVC cement and primer
• 8-inch main run with 4-inch branch outlet for lateral tie-in applications
• PVC material resists corrosion, root intrusion chemicals, and common sewage constituents
• Swept branch geometry supports gravity-flow drainage and reduces turbulence at the junction

Compatibility

Designed as an OEM-style replacement and new-installation fitting for SDR-35 PVC sewer and drain piping systems using solvent weld joints.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC) where adopted. Ensure all pipe ends are cut square, deburred, and dry before applying PVC primer and solvent cement. For below-grade installations, follow local bedding and backfill requirements to provide uniform support around the fitting. Do not apply heat or mechanical force to seat solvent weld joints.

Technical Specifications

• Main Run Size: 8 inches
• Branch Outlet Size: 4 inches
• Connection Type: Solvent Weld Socket
• Pipe Standard: SDR-35
• Material: PVC
• Weight: 7.58 pounds

Standard Information

• Brand: WESTLAKE PIPE FITTINGS
• Manufacturer Part Number: P158-4