3 inch Copper DWV Coupling Copper x Copper

3 inch Copper DWV Coupling – Seamless Fitting for Drain, Waste, and Vent Systems

The 3 inch Copper DWV Coupling is a short, cylindrical fitting designed to connect two sections of copper drain, waste, and vent piping in non-pressurized plumbing systems. Manufactured from wrought copper in accordance with ASTM B75 or equivalent standards, this coupling supports soldered (sweat) connections that ensure smooth, code-compliant transitions in DWV pipelines.

Its full-flow interior and uniform wall thickness allow for unrestricted drainage while maintaining the integrity and slope of horizontal or vertical piping systems. Compatible with Type DWV copper tubing, it is intended for gravity-based waste systems and is not rated for pressurized applications.

Product Specifications

• Material: Wrought copper (typically alloy C12200)
• Size: 3 inch nominal pipe size
• Connection Type: Sweat x Sweat (cup ends)
• Applicable Standards: ASME B16.29, ASTM B306, NSF 61 (lead-free compliance)
• Application: Non-pressurized drain, waste, and vent systems

Installation Requirements

Designed for soldered joint assembly using standard copper DWV tubing. Pipe ends should be cleaned, reamed, and fluxed prior to insertion. Apply heat evenly and use lead-free solder to ensure full circumferential bonding. System should be supported per code and tested following installation to verify drainage integrity and leak resistance.

Common Applications

This coupling is widely used in residential, commercial, and institutional buildings to join sections of 3 inch copper DWV pipe in horizontal runs, vertical stacks, or offsets. Common locations include in-wall drainage assemblies, ceiling chases, and main building drains in multi-story structures.

Material Performance

Copper DWV systems offer excellent corrosion resistance, low maintenance, and long-term reliability. The coupling’s soldered joints eliminate mechanical threads, reducing potential leak points and maintaining consistent interior flow characteristics throughout the system.