NIBCO 1-1/2 in. Copper X 1-1/2 in. D FPT Copper DWV Adapter

Introducing the NIBCO 1-1/2 in Copper X 1-1/2 in D FPT Copper DWV Adapter—a robust, purpose-built connector designed for above-ground drain-waste-vent (DWV) piping. This adapter pairs a copper end with a 1-1/2 in copper connection to a 1-1/2 in female pipe thread (FPT) end, giving you a reliable bridge between copper plumbing and threaded components in residential DWV assemblies.

Key features

• Material: copper with a 1-1/2 in copper pipe end and a 1-1/2 in FPT threaded end
• Maximum working pressure: 408
• Lead content: less than 0.25% average, supporting code compliance in many installations
• Packaging: bagged, single-piece configuration for easy handling and storage
• Not suitable for underground burial applications; intended for above-ground DWV runs
• Brand: NIBCO, a long-standing name in dependable plumbing fittings

Ideal use cases

• Connecting a copper DWV drain line to a threaded drain component in above-ground installations, such as wall-mounted traps, cleanouts, or fixtures with male-threaded connections
• Remodels or new construction where copper piping meets threaded DWV hardware, enabling a secure, leak-resistant transition
• Repairs where a copper-to-threaded adapter is needed to maintain a copper DWV run without replacing large sections of pipe

Why this copper DWV adapter matters

• Durability and corrosion resistance: copper provides reliable long-term performance in DWV systems, resisting corrosion and maintaining flow integrity over time
• Code-aware composition: with average lead content under 0.25%, this adapter meets expectations for safer materials in many plumbing scenarios
• Versatile connection options: the copper end accepts standard 1-1/2 in copper piping, while the FPT end accepts corresponding threaded components, enabling flexible system design
• Practical for upgrades and repairs: a compact, single-piece adapter simplifies installations where you need to convert copper to threaded drainage connections without replacing entire runs

Installation tips and best practices

• prepare the copper end by cleaning and fluxing the surface, then solder it to a 1-1/2 in copper pipe using standard copper-soldering techniques
• on the FPT end, apply an appropriate thread sealant rated for metal pipes (PTFE tape or pipe joint compound) and tighten to the manufacturer's recommended torque to avoid leaks
• test the assembly with a controlled water test after installation to verify a secure seal before returning the system to service
• avoid overtightening threaded connections, which can damage threads and compromise the seal

Who should consider this adapter

• Professional plumbers and contractors working on copper DWV systems
• DIY homeowners tackling copper-to-threaded transitions in above-ground drainage runs
• Renovation projects where maintaining copper DWV paths while integrating threaded components is advantageous

The NIBCO 1-1/2 in Copper X 1-1/2 in D FPT Copper DWV Adapter is a practical, purpose-built solution for connecting copper pipes to threaded DWV fittings. By combining a durable copper connection with a standardized 1-1/2 in FPT end, it delivers a secure, long-lasting transition that supports reliable drainage performance in everyday plumbing scenarios.