Mueller 168-003nl Brass Dielectric Union, 1/2 In. Fip X Sweat, 250 Psi

A dielectric union is an essential plumbing fitting that prevents electrolysis and galvanic corrosion when connecting dissimilar metals—such as copper and steel pipes—in the same water system. This Mueller 168-003NL brass dielectric union connects 1/2 inch female iron pipe (FIP) threaded connections to 1/2 inch copper sweat (solder) connections, making it ideal for mixed-material plumbing repairs and installations. By isolating different metals from direct contact, it protects your plumbing system from accelerated corrosion, maintains water quality, and extends the service life of your pipes and fittings.

Whether you're a professional plumber, contractor, or do-it-yourself homeowner, this fitting simplifies projects that combine threaded and soldered connections. Installation is straightforward: thread one end onto your iron pipe and solder the other end to your copper line. The brass construction provides reliable performance in plumbing systems.

Features and Benefits

• Dual Connection Types: Combines FIP threaded and copper sweat connections in one fitting, eliminating the need for multiple adapters.
• Corrosion Protection: Dielectric design prevents galvanic action and electrolysis between dissimilar metals, preserving pipe integrity and water quality.
• Durable Brass Body: High-quality brass construction resists corrosion and provides reliable performance.
• High Pressure Rating: Rated for 250 PSI at 180°F.
• Standards Compliance: Threaded ends meet ANSI B1.20.1 and solder ends meet ANSI B16.18, ensuring quality and safety.

Specifications

• Brand: Mueller (Proline)
• Model: 168-003NL
• Size: 1/2 inch FIP x 1/2 inch Copper Sweat
• Material: Brass
• Pressure Rating: 250 PSI at 180°F
• Threaded End Standard: ANSI B1.20.1
• Solder End Standard: ANSI B16.18