4 inch x 2 inch PCV DWV Reducing Coupling Plastic x Plastic

4" x 2" PVC DWV Reducing Coupling – Solvent Weld Fitting for Drainage and Vent Applications

The 4" x 2" PVC DWV Coupling is a reducing fitting designed for use in non-pressurized drainage, waste, and vent (DWV) systems. Fabricated from durable polyvinyl chloride (PVC), it enables direct connection between 4-inch and 2-inch nominal size piping with solvent weld socket ends, providing a permanent and leak-resistant transition point within horizontal or vertical piping layouts.

This fitting is suitable for residential and commercial installations and conforms to dimensional requirements for Schedule 40 DWV applications. It facilitates compact reductions in-line, eliminating the need for additional adapters or bushings where space is limited.

Performance Features

• ✅ DWV-Rated PVC Construction – Formulated for waste and vent systems; not intended for pressurized water use.
• ✅ Socket x Socket Configuration – Accepts standard 4" and 2" Schedule 40 DWV pipe for solvent weld connections.
• ✅ Integrated Size Transition – Directly reduces larger pipe to smaller diameter in-line without extra components.
• ✅ Corrosion and Chemical Resistance – PVC material resists scaling and degradation in sanitary environments.
• ✅ Code-Conforming – Complies with ASTM D2665 and relevant sections of the Uniform Plumbing Code (UPC) and International Plumbing Code (IPC).

Installation Guidance

Install using approved PVC primer and solvent cement in accordance with local plumbing code. Proper pipe preparation is required, including cutting square, deburring, dry-fitting, and marking insertion depth. Allow sufficient curing time before testing or system pressurization. This coupling is for gravity flow DWV systems only and not designed for potable or pressurized fluid handling.

Typical Applications

This reducing coupling is used in DWV assemblies for the following purposes:

• Reducing branch line connections within waste stacks
• Transitions between different fixture drainage diameters
• Retrofit projects requiring diameter reduction without altering layout spacing

Material Considerations

PVC DWV fittings are widely used in sanitary drainage systems due to their lightweight construction, corrosion resistance, and solvent-weld compatibility. Their dimensional stability and chemical resistance make them a preferred material for code-compliant waste systems.

Technical Specifications

• Material: PVC (Polyvinyl Chloride), ASTM D2665 compliant
• Size: 4 inch x 2 inch (nominal)
• Connection Type: Slip fit / Socket x Socket
• System Type: Drainage, Waste, and Vent (DWV) – non-pressurized
• Certifications: UPC listed, NSF-dwv certified

The 4" x 2" PVC DWV Reducing Coupling provides a code-compliant, solvent-welded transition for drainage systems requiring size reduction in confined or critical piping configurations. It is a standard component in new construction and retrofit waste system installations.