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Brass and steel dielectric union with zinc-plated iron nut, 1-1/4 inch NPT threads

Watts

Watts LF3003 Dielectric Union Brass Steel 1-1/4" F NPT 250 psi

SKU CH-GC9C-PVZ27

Connects dissimilar metal pipes while preventing galvanic corrosion, rated for 250 psi and 33 to 180 degrees Fahrenheit

  • Prevents galvanic corrosion with brass-to-steel dielectric separation
  • Handles 250 psi maximum operating pressure for reliable service
  • Operates from 33 to 180 degrees F across temperature ranges
  • Polysulfone insulator and Buna-N gasket ensure leak-free sealing
  • Zinc-plated malleable iron nut provides durable mechanical strength

Watts LF3003 Dielectric Union Overview

The Watts LF3003 is a dielectric union designed to connect dissimilar metal piping systems while preventing galvanic corrosion. It features a brass and steel construction with female NPT threads on both ends for secure installation. This fitting suits plumbers and maintenance crews joining copper or brass lines to steel pipe in water supply applications. Its polysulfone insulator and Buna-N gasket provide the necessary electrical isolation at the joint.

Installation Requirements Check

Before ordering, verify that your existing piping uses 1-1/4 inch female NPT threads to match the union ends. Confirm the system fluid is compatible with Buna-N gasket material and polysulfone insulation across the operating temperature range. Ensure the working pressure does not exceed the 250 psi maximum rating stamped on the body. The 2 3/4 in overall length must fit within your available pipe run clearance without forcing alignment.

Sustained Load Behaviour

Under continuous pressure up to 250 psi the brass and steel body maintains structural integrity without permanent deformation. The polysulfone insulator resists creep while the Buna-N gasket retains sealing force across the 33 to 180 degrees F service window. Zinc-plated malleable iron nuts resist corrosion during extended exposure to moisture and thermal cycling. The dielectric break remains effective over long periods preventing accelerated galvanic attack on connected steel pipe.

Highlights

  • Prevents galvanic corrosion with brass-to-steel dielectric separation
  • Handles 250 psi maximum operating pressure for reliable service
  • Operates from 33 to 180 degrees F across temperature ranges
  • Polysulfone insulator and Buna-N gasket ensure leak-free sealing
  • Zinc-plated malleable iron nut provides durable mechanical strength

Specifications

BrandWATTS

Questions about this item

What comes with the Watts LF3003 dielectric union and what must I buy separately?

The union includes a brass body, steel tailpiece, zinc-plated malleable iron nut, Buna-N gasket and polysulfone insulator assembled to 2 3/4 in overall length. Pipe thread sealant or tape for the 1-1/4 in female NPT connections is not included.

Which Watts LF3003 version should I choose for my pressure and temperature needs?

The LF3003 is rated for 250 psi maximum operating pressure and a temperature range of 33 to 180 degrees F. Select this model when your system stays within those limits; no other capacity or pressure variant is offered under this part number.

What does the 250 psi rating mean once the Watts LF3003 is installed in my plumbing?

It means the union can continuously handle up to 250 psi water pressure at temperatures between 33 and 180 degrees F without leaking or structural failure, provided the NPT threads are properly sealed and the Buna-N gasket remains intact.

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