1-1/2 inch x 1-1/4 inch Copper DWV Reducing Adapter Male x Copper

1-1/4 inch x 1-1/2 inch Copper DWV Reducing Adapter – Code-Compliant Transitions for Drainage Systems

The 1-1/4 inch x 1-1/2 inch Copper DWV Reducing Adapter is manufactured for joining dissimilar-sized copper drain, waste, and vent lines in non-pressurized systems. Commonly used in residential and commercial DWV configurations, this fitting facilitates a step-up transition while preserving system flow characteristics and minimizing pressure loss.

Fabricated from wrought copper conforming to ASTM standards, this adapter is suitable for horizontal and vertical runs and allows for direct soldering into copper tubing. Its design supports smooth internal transitions, which helps reduce the potential for buildup or turbulence in the flow path.

Key Features

• ✅ Material: Wrought copper (typically Alloy C12200), suitable for DWV systems
• ✅ Configuration: 1-1/4 inch male end x 1-1/2 inch socket (female) end
• ✅ Application: Drain, Waste, and Vent systems (not intended for potable water or pressurized lines)
• ✅ Compliance: Meets or exceeds ASME B16.29 and NSF/ANSI 61 for lead-free components
• ✅ Finish: Smooth-machined surfaces to aid in uniform soldering

Installation Considerations

This copper reducing adapter is intended for sweat (soldered) installation. Joints should be properly cleaned, fluxed, and soldered using lead-free solder per IPC/UPC code. Ensure correct alignment to prevent stress at connection points. The fitting is not pressure-rated and should be used only in gravity-flow DWV systems.

Where It’s Commonly Used

Designed for use in DWV copper systems, this fitting is frequently installed during bathroom and kitchen remodels, re-piping, or system expansions where a size reduction is necessary. It is ideal for branch-to-main connections or fixture arms transitioning into larger horizontal waste lines.

Specification Highlights

• Nominal Sizes: 1-1/4 inch (small end) x 1-1/2 inch (large end)
• Connection Type: Male sweat x female socket
• Material Standard: ASTM B75/B88 copper, lead-free
• Fitting Type: Reducing Adapter for DWV use

Did You Know?

Copper DWV fittings are preferred in many jurisdictions for their flame resistance, long service life, and recyclability. Use of lead-free copper fittings is federally mandated for all installations in potable water systems and often specified for DWV systems to ensure uniformity and safety.

The 1-1/4 inch x 1-1/2 inch Copper DWV Reducing Adapter delivers consistent performance in gravity-flow drain systems and complies with modern construction codes. When system integrity and long-term performance matter, this fitting provides a reliable transition between line sizes with proven material quality.