Spears 100203 Adapter Coupling 4x3 in S/d to Dwv

Product Description

The SPEARS 100203 is a 4-inch by 3-inch adapter coupling designed to transition between S/D (soil and drain) pipe and DWV (drain, waste, and vent) pipe systems. This fitting creates a reliable mechanical connection where pipe sizing or system type changes within a drainage run. It is used by licensed plumbers working on residential and light commercial drain, waste, and vent assemblies. The 4-inch hub end connects to S/D pipe while the 3-inch end connects to DWV pipe, making it well-suited for reducing transitions in gravity-flow drain lines.

This adapter coupling is typically installed in below-grade or above-grade drain and waste systems where a change in pipe diameter or pipe specification occurs between sections. Common applications include stack reductions, branch transitions, and tie-ins between different pipe specifications within a building drain system. It is appropriate for new construction as well as repair and replacement work on existing DWV assemblies.

Key Features

• Transitions between 4-inch S/D and 3-inch DWV pipe in a single fitting
• Hub-style coupling design for solvent-weld installation
• Suited for gravity-flow drain, waste, and vent applications
• Compatible with standard DWV solvent cement joining methods

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 4-inch S/D to 3-inch DWV pipe transitions in residential and light commercial plumbing drain systems.

Installation Notes

Installation should be performed by a licensed plumber in accordance with the International Plumbing Code (IPC) and applicable local codes. Shut off water supply and ensure the drain line is clear and dry before joining. Use the appropriate PVC or ABS solvent cement and primer as specified for the pipe material, and allow adequate cure time before restoring flow. Do not apply mechanical stress to the joint before the cement has fully cured.

Technical Specifications

• Inlet Size: 4 inches
• Outlet Size: 3 inches
• Connection Type: S/D to DWV adapter coupling
• Application: Drain, Waste and Vent (DWV)

Standard Information

• Brand: SPEARS
• Manufacturer Part Number: 100203