1-1/4 inch Copper DWV Coupling Copper x Copper

1-1/4 inch Copper DWV Coupling – Durable Fitting for Drain, Waste, and Vent Systems

The 1-1/4 inch copper DWV (Drain, Waste, and Vent) coupling is a solder-joint fitting used to join two sections of copper tubing in non-pressurized systems. Constructed from high-grade copper and manufactured to ASTM standards, this fitting ensures long-term performance in sanitary drainage systems where reliability and corrosion resistance are required.

Key Product Features

• ✔️ Application: Designed for DWV systems in residential and light commercial plumbing
• ✔️ Material Specification: Wrought copper per ASTM B75/B88 standards
• ✔️ Connection Type: Cup (solder) x Cup – requires soldering for leak-proof joints
• ✔️ Compliance: Conforms to ASME B16.29 and NSF/ANSI 61 & 372 for lead-free plumbing installations
• ✔️ Temperature & Pressure: Suitable for gravity drainage at ambient temperatures – not for pressurized service

Installation Guidance

This coupling must be installed using standard soldering techniques with appropriate flux and lead-free solder. Surfaces should be cleaned and properly prepared to ensure complete capillary fill during soldering. A tight dry-fit is essential before applying heat. Best practices include verifying DWV system slope and flow direction prior to installation.

Use Cases

Commonly used to extend or repair horizontal or vertical DWV copper lines. Ideal for bathroom, kitchen, or laundry branch drains and venting. Its compact form allows installation in confined spaces within walls, floors, and ceilings.

Did You Know?

DWV copper fittings differ from pressure-rated fittings by having thinner walls, making them lighter and more cost-effective for gravity-based drainage applications. Although not rated for potable water under pressure, they provide reliable service in non-pressurized waste systems.

Specifications Summary

• Size: 1-1/4 inch
• Material: Copper (ASTM B75/B88)
• Type: DWV Coupling – Solder x Solder
• Standard: ASME B16.29
• Certifications: NSF/ANSI 61 & 372 (lead-free compliance)

Choosing high-quality DWV fittings like this 1-1/4 inch copper coupling ensures compliance with code and durability in low-pressure plumbing systems. It’s engineered for clean transitions and ease of installation, providing long-term value for professional-grade installations.