Matco-norca dun-2009 Dielectric Union 2 in Copper Sweat X Fpt

Product Description

The MATCO-NORCA dun-2009 is a lead-free dielectric union designed to connect copper sweat (C) pipe to female NPT threaded pipe at 2 inches. Dielectric unions prevent galvanic corrosion by isolating dissimilar metals — typically copper and galvanized steel or iron — at the point of connection. This fitting is a required component wherever a copper system transitions to a ferrous or steel-threaded line, and it is installed by licensed plumbers in both new construction and retrofit service work. The lead-free construction meets modern potable water standards. Weighing 2.17 pounds, this is a full 2-inch fitting suited for higher-flow domestic or light commercial water service lines.

The dun-2009 is used in residential and light commercial plumbing systems where copper supply lines meet threaded steel or iron components such as water heaters, boilers, meters, and main shutoff valve assemblies. The sweat end connects to standard copper tubing using conventional solder or braze methods, while the female NPT end threads onto compatible male-threaded fittings or equipment connections. The dielectric insert and washer isolate the two metals and prevent electrolytic action that would otherwise cause accelerated corrosion at the joint over time.

Key Features

• Lead-free construction — compliant with potable water installation requirements
• Dielectric isolation separates dissimilar metals to prevent galvanic corrosion
• 2-inch copper sweat (C) inlet for direct soldering to copper tubing
• Female NPT (FPT) outlet for connection to male-threaded steel or iron pipe
• Union design allows the joint to be disconnected and reconnected without cutting pipe

Compatibility

Designed as an OEM-style replacement or new-installation dielectric union for 2-inch copper sweat to female NPT threaded transitions in residential and light commercial plumbing systems.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the applicable International Plumbing Code (IPC) provisions. Shut off the water supply and relieve system pressure before disassembling any existing union or soldering new connections. Use appropriate flux and lead-free solder on the sweat end, and apply thread sealant or PTFE tape to the NPT threads before assembly. Do not overtighten the union nut, as the internal dielectric components can be damaged by excessive torque.

Technical Specifications

• Fitting Size: 2 inches
• Connection Type: Copper Sweat (C) x Female NPT (FPT)
• Type: Dielectric Union
• Lead Free: Yes
• Item Weight: 2.17 pounds

Standard Information

• Brand: MATCO-NORCA
• Manufacturer Part Number: dun-2009