Matco-norca dun-ea03 Dielectric Union 1/2 Inch Fpt X Fpt

Product Description

The MATCO-NORCA dun-ea03 is a lead-free dielectric union designed to isolate dissimilar metal piping systems and prevent galvanic corrosion at the joint. Sized at 1/2 inch with female pipe thread connections on both ends, this fitting creates an electrically non-conductive break between copper and steel or iron pipe sections. It is a standard plumbing component used in residential and light commercial water supply systems wherever two different metals meet. Licensed plumbers specify dielectric unions to comply with plumbing codes that require galvanic isolation at bimetal connections, including water heater installations.

This fitting is suited for potable water supply applications where lead-free compliance is required. The FPT x FPT (female pipe thread by female pipe thread) configuration allows the union to thread directly onto male-threaded pipe ends on both sides of the joint. Common install scenarios include water heater stub-out connections, boiler supply and return piping, and anywhere copper tubing terminates at a steel fitting or valve body. Its lead-free construction meets requirements for use in drinking water systems under NSF and applicable state plumbing codes.

Key Features

• Lead-free construction for potable water and drinking water system compliance
• 1/2 inch FPT x FPT (female pipe thread both ends) connection type
• Dielectric insulating barrier prevents galvanic corrosion between dissimilar metals
• Union design allows in-line disassembly without cutting pipe
• Lightweight at 0.42 pounds per unit

Compatibility

Designed as an OEM-style replacement dielectric union for 1/2 inch female pipe thread applications in residential and light commercial water supply piping 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 disassembling or replacing the union. Apply thread sealant or PTFE tape to male pipe threads before engagement, and tighten to hand-snug plus wrench-tight without over-torquing the union nut. Do not use this fitting in steam or high-pressure applications unless the system rating is confirmed to match the fitting specifications.

Technical Specifications

• Fitting Size: 1/2 inch
• Connection Type: FPT x FPT (Female Pipe Thread x Female Pipe Thread)
• Type: Dielectric Union
• Lead Free: Yes
• Item Weight: 0.42 pounds

Standard Information

• Brand: MATCO-NORCA
• Manufacturer Part Number: dun-ea03