Wilkins 1-DUXLC Dielectric Union 1 in Fnpt X Female C

Product Description

The WILKINS 1-DUXLC is a dielectric union designed to isolate dissimilar metals in piping systems and prevent galvanic corrosion at connection points. The union features a 1-inch FNPT (female NPT) inlet on one side and a 1-inch Female C (sweat/solder) connection on the other, making it suitable for installations where copper tubing meets threaded steel or iron pipe. Constructed from steel, this union provides the mechanical strength needed for residential and light commercial plumbing and HVAC hydronic systems. Licensed plumbers and HVAC technicians install dielectric unions as a code-required measure wherever copper and ferrous piping meet.

The 1-DUXLC is used in residential and commercial plumbing systems at connection points between copper supply lines and threaded steel or galvanized pipe, such as at water heater inlets and outlets, boiler connections, and hydronic heating system tie-ins. The FNPT x Female C configuration accommodates a direct transition from threaded iron or steel pipe to copper tubing without requiring an adapter. This fitting is suitable for domestic hot and cold water service and hydronic heating applications where galvanic isolation is required by plumbing code.

Key Features

• Dielectric insert isolates copper from steel or iron piping to stop galvanic corrosion
• 1-inch FNPT x Female C connection accommodates threaded-to-sweat transitions
• Steel construction provides durability for pressure piping applications
• Standard union design allows for future disconnection without cutting pipe
• Suitable for water heater, boiler, and hydronic system connections

Compatibility

Designed as an OEM-style replacement or new-installation dielectric union for residential and commercial plumbing systems requiring a 1-inch FNPT x Female C galvanic isolation fitting.

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 depressurize the system before installation. The Female C (sweat) end requires soldering with appropriate flux and lead-free solder per code; do not apply torch heat directly to the dielectric insert or union body. Apply thread sealant or PTFE tape to the FNPT end before threading onto the mating fitting.

Technical Specifications

• Connection Size: 1 inch
• Connection Type: FNPT x Female C (Sweat)
• Material: Steel

Standard Information

• Brand: WILKINS
• Manufacturer Part Number: 1-DUXLC