1 inch Dielectric Union Female x Copper

1 inch Dielectric Union – FIP x Sweat, Lead-Free, Corrosion-Resistant

The 1 inch dielectric union is engineered to electrically isolate dissimilar metals in water distribution systems, helping prevent galvanic corrosion at the transition point. This union features a 1 inch female iron pipe (FIP) threaded end and a 1 inch copper sweat connection, providing a secure, code-compliant interface between steel and copper piping.

Constructed with lead-free components in accordance with NSF 61 and NSF 372 standards, this fitting is designed for potable water systems and meets requirements for use in residential, commercial, and institutional plumbing. The dielectric insulating washer and gasket prevent direct metal-to-metal contact, extending the service life of system components.

Product Features

• ✅ Connection Type: 1 inch FIP x 1 inch Copper Sweat
• ✅ Material: Lead-free brass/copper alloy and galvanized steel with insulating components
• ✅ Insulating Components: Thermoplastic liner and elastomeric gasket to prevent galvanic reaction
• ✅ Working Pressure: Rated to 250 psi (non-shock)
• ✅ Temperature Range: Suitable for service temperatures up to 180°F

Standards & Compliance

• ✔ NSF/ANSI 61 & 372: Certified for use in potable water systems
• ✔ ASTM Standards: Meets mechanical and material requirements for residential and commercial plumbing applications
• ✔ UPC / IPC Code Compliant for building code acceptance

Installation Guidelines

Ensure proper alignment and sealing surface cleanliness prior to assembly. Use thread sealant or PTFE tape on the threaded end. Solder the sweat connection using lead-free solder and appropriate flux, avoiding excessive heat near the insulating components. Allow cooling time before applying system pressure. Avoid over-tightening to prevent deformation of sealing surfaces or damage to the dielectric insulator.

Applications

This union is used where copper and ferrous pipe systems interface—typically at water heater connections, riser transitions, pump manifolds, or building entry points. It is a required component in installations subject to local or national code requirements for protection against electrochemical corrosion.

Material Insight

Galvanic corrosion can occur when dissimilar metals are joined in the presence of an electrolyte. Dielectric unions mitigate this issue through physical and electrical separation, maintaining system integrity in mixed-metal piping configurations.