Value Collection 165-103NL Dielectric Union 1/2 Fnpt X Sweat

Product Description

The VALUE COLLECTION 165-103NL is a dielectric union designed to join dissimilar metals in plumbing systems while preventing galvanic corrosion. It features a 1/2-inch female NPT (FNPT) thread on one end and a 1/2-inch sweat (solder) connection on the other, making it suitable for transitioning between copper and steel or iron pipe runs. The dielectric insert electrically isolates the two pipe sections, stopping the electrochemical reaction that degrades metal fittings over time. Licensed plumbers and pipefitters install this fitting during new construction and retrofit work where code requires galvanic separation at dissimilar-metal joints.

This dielectric union is used in residential and light commercial plumbing systems wherever copper tubing meets threaded steel or galvanized pipe. Common install points include water heater connections, boiler supply and return lines, and service entry points. The sweat end accepts standard 1/2-inch copper tubing, and the threaded end connects to 1/2-inch NPT male fittings. The fitting is packaged individually and suited for single-unit repair or replacement jobs as well as multi-unit service calls.

Key Features

• Dielectric insert isolates dissimilar metals to prevent galvanic corrosion
• 1/2-inch FNPT thread end accepts standard male NPT fittings
• 1/2-inch sweat end compatible with standard copper tubing
• Compact form factor at approximately 1.85 inches tall and 1.31 inches in length
• Lightweight at 0.46 pounds for easy single-hand positioning during install

Compatibility

Designed as an OEM-style replacement or new-install fitting for 1/2-inch plumbing connections requiring a threaded-to-sweat dielectric transition in residential and light commercial systems.

Installation Notes

Installation should be performed by a licensed plumber in accordance with the International Plumbing Code (IPC) and applicable local codes. Shut off the water supply and relieve system pressure before disassembly. The sweat end requires standard soldering tools and lead-free solder per applicable code requirements. Do not over-torque the threaded connection, and inspect the dielectric sleeve for proper seating before pressurizing the system.