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Watts 3/4 LF3003 dielectric union brass zinc plated steel threaded ends polysulfone insulator NBR gasket

Watts

Watts 3/4 LF3003 Dielectric Union trap

SKU CH-DTZD-ETQP4 MPN 3/4

Connects 3/4-inch female-threaded pipes with a dielectric union rated for 250 psi and 33 to 180 degrees F

  • TypeDrain Components
  • Dielectric insulation prevents galvanic corrosion between dissimilar metals
  • Brass and zinc-plated steel construction resists corrosion in plumbing systems
  • 250 psi maximum operating pressure handles demanding water supply applications
  • Polysulfone insulator with NBR gasket ensures reliable sealing performance
  • Operates from 33 to 180 degrees Fahrenheit for hot and cold water use

Dielectric Union for Plumbing Systems

The Watts 3/4 LF3003 dielectric union connects dissimilar metal piping to prevent galvanic corrosion. It is intended for plumbers and facility technicians who need a reliable transition fitting in potable water or hydronic installations. The component uses a polysulfone insulator and NBR gasket to maintain separation between brass and steel surfaces.

Threaded Brass and Steel Construction

This union fits into a line using 3/4 inch female threaded ends on both the FIP and FBP sides. The brass and zinc-plated steel body requires standard pipe thread sealant or tape during assembly. It frees the installer from soldering dissimilar metals directly and allows future disassembly for maintenance or equipment replacement without cutting pipe.

Rated for 250 psi and 180 Degrees F

The fitting handles a maximum operating pressure of 250 psi across a temperature range of 33 to 180 degrees Fahrenheit. The polysulfone insulator and NBR gasket maintain sealing integrity under these conditions. The steel union nut secures the joint mechanically so the assembly remains leak-free during normal thermal cycling and pressure fluctuations.

Highlights

  • Dielectric insulation prevents galvanic corrosion between dissimilar metals
  • Brass and zinc-plated steel construction resists corrosion in plumbing systems
  • 250 psi maximum operating pressure handles demanding water supply applications
  • Polysulfone insulator with NBR gasket ensures reliable sealing performance
  • Operates from 33 to 180 degrees Fahrenheit for hot and cold water use

Specifications

TypeDrain Components
BrandWatts
Model3/4 LF3003

Questions about this item

Will the 250 psi rating hold up on a system that runs at the upper end of the temperature range all day?

The union is rated for 250 psi maximum operating pressure across the full 33 to 180 degrees F range, so it will maintain that pressure limit even during continuous high-temperature operation.

Does the polysulfone insulator and NBR gasket keep the joint cool and quiet when water circulates constantly?

The polysulfone insulator blocks galvanic corrosion without adding heat, and the NBR gasket seals silently; neither component generates noise or measurable temperature rise during all-day flow.

My copper lines are male-threaded — what else do I need to connect this female-threaded union?

You will need 3/4 inch male pipe nipples or adapters to join your copper lines to the union's female iron pipe and female brass pipe threads.

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