Value Collection 168-004NL Dielectric Union 3/4 in

Product Description

The VALUE COLLECTION 168-004NL is a dielectric union designed to join dissimilar metals in plumbing systems while preventing galvanic corrosion. This fitting isolates copper and steel piping at the connection point, stopping the electrochemical reaction that degrades fittings over time. It accepts a 3/4-inch female NPT thread on one end, a 3/4-inch male NPT thread on the other, and includes a 3/4-inch sweat connection option. At 0.4 pounds and measuring 1.75 inches wide by 2.75 inches in height, this is a compact, install-ready fitting suited for licensed plumbers working on residential and light commercial water service lines.

Dielectric unions are standard practice wherever copper water supply lines connect to galvanized steel or other ferrous pipe. This fitting is used in residential water heater installations, boiler supply and return lines, and potable water distribution systems where code requires isolation of dissimilar metals. The three connection options — FNPT, MNPT, and sweat — give installers flexibility across different piping configurations without additional adapters.

Key Features

• Dielectric union design prevents galvanic corrosion between dissimilar metals
• 3/4-inch FNPT, 3/4-inch MNPT, and 3/4-inch sweat connections in one fitting
• Compact footprint at 1.75 inches wide and 2.75 inches tall
• Lightweight at 0.4 pounds for easy single-hand positioning during install
• Sold as a single unit — no minimum bulk purchase required

Compatibility

Designed as an OEM-style replacement or new-installation dielectric union for 3/4-inch residential and light commercial plumbing systems requiring isolation of dissimilar metal pipe connections.

Installation Notes

Installation is performed by a licensed plumber. Shut off the water supply and depressurize the line before disassembly or fitting installation. Follow local plumbing code and IPC requirements for dielectric isolation in potable water systems. Do not overtighten threaded connections; use appropriate thread sealant or tape on NPT threads, and apply proper flux and solder technique on sweat connections.