Value Collection 165-104NL Dielectric Union 3/4 in

Product Description

The VALUE COLLECTION 165-104NL is a dielectric union designed to join dissimilar metal piping systems while preventing galvanic corrosion. The fitting connects copper, steel, or other metallic pipe runs by electrically isolating the two sides of the joint. It ships as a single unit and is suited for residential and light commercial plumbing installations. The 165-104NL accepts a 3/4-inch female NPT thread on one end, a 3/4-inch male NPT thread on the opposing end, and a 3/4-inch sweat (solder) connection, giving installers multiple joining options in a single fitting.

This dielectric union is used wherever dissimilar metals meet in a potable water or hydronic system — a common requirement at water heater connections, boiler supply and return lines, and meter sets. Licensed plumbers install this fitting when transitioning from copper tubing to galvanized or black iron pipe to comply with plumbing codes that prohibit direct metal-to-metal contact between incompatible materials. It is appropriate for both residential and light commercial applications.

Key Features

• Dielectric isolation prevents galvanic corrosion at dissimilar metal joints
• Three connection options: 3/4-inch FNPT, 3/4-inch MNPT, and 3/4-inch sweat
• Compact footprint — 1.85 inches tall, 1.31 inches in length, and 1.22 inches wide
• Lightweight at 0.65 pounds for easy single-hand positioning during assembly
• Single-piece packaging supports one-off service calls and repair work

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 3/4-inch residential and light commercial plumbing systems requiring dielectric separation at dissimilar metal transitions.

Installation Notes

Installation is performed by a licensed plumber in accordance with the applicable International Plumbing Code (IPC) or local equivalent. Shut off the water supply and relieve system pressure before disassembling any existing union or making new connections. When using the sweat end, ensure the pipe and fitting are clean and properly fluxed before soldering; allow the joint to cool completely before pressurizing. Do not over-tighten threaded connections — use appropriate thread sealant or PTFE tape on NPT threads.