1-1/2 inch x 1-1/4 inch Copper DWV Reducing Trap Adapter Copper x Slip Joint

1-1/4 inch Copper DWV Reducing Trap Adapter – Slip Joint x Copper for Drainage Systems

The 1-1/4 inch Copper DWV Reducing Trap Adapter is engineered for transitions between a 1-1/4 inch slip joint connection and a 1-1/2 inch copper tube interface within drain, waste, and vent (DWV) systems. This fitting is manufactured from high-grade wrought copper, meeting the dimensional and performance standards required for reliable gravity-flow drainage in residential and commercial applications.

Designed to facilitate the connection of tubular trap arms to copper DWV stacks, this reducing adapter streamlines trap installations while maintaining system integrity and code compliance. It offers a secure slip joint inlet for chrome-plated or tubular trap arms, reducing to a sweat or soldered copper outlet connection.

Product Specifications

• Size: 1-1/4 inch Slip Joint x 1-1/2 inch Copper
• Material: Wrought Copper (ASTM B75/B88)
• Fitting Type: Reducing Trap Adapter
• Application: DWV (Drain, Waste, and Vent) Systems
• Connection: Slip Joint Inlet x Copper Sweat Outlet
• Compliance: ASME B16.29, NSF/ANSI 61, Lead-Free (SDWA compliant)

Key Features

• Corrosion Resistance: Copper construction offers excellent resistance to chemical degradation and scaling common in DWV systems.
• Dimensional Precision: Manufactured to consistent tolerances to ensure proper mating with tubular and copper DWV components.
• Slip Joint Assembly: Enables quick disassembly for maintenance access to traps or tailpieces, making it ideal for lavatory and sink installations.
• Lead-Free: Meets Safe Drinking Water Act requirements for potable and drainage systems.
• Thermal Stability: Suitable for use in temperature ranges typical of residential waste systems without distortion or separation.

Common Applications

• Bathroom and kitchen sink trap arm transitions
• Connection of tubular chrome waste arms to copper vertical stacks
• Renovation and retrofit projects requiring mixed-material interface
• Low-pressure DWV connections requiring slip joint access

Installation Notes

Use standard compression slip joint washers and nuts on the 1-1/4 inch side, and solder or braze the 1-1/2 inch copper side according to accepted plumbing practices. Ensure that fittings are properly aligned and torqued to avoid misalignment or leaks. For vertical installations, support piping according to code-specified intervals.

Did You Know?

Per UPC and IPC guidelines, copper DWV fittings are approved for use in horizontal and vertical drainage systems and offer a service life that exceeds 50 years when properly installed.

The 1-1/4 inch Copper DWV Reducing Trap Adapter is a practical solution for integrating tubular waste connections into copper systems. Built to code and precision-fit for dependable performance, this adapter is an essential component for efficient drainage layout in professional-grade installations.