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Brass dielectric union with galvanized steel nut and polysulfone insulator, 3 inch overall length

Watts

Watts 3/4 LF 3005-3/4A Dielectric Union Trap

SKU CH-T9R4-YXP25 MPN 3/4

Connects 3/4-inch male NPT and male solder joints with brass and zinc-plated steel construction rated for 250 psi and 33 to 180 degrees F

  • TypeDrain Components
  • Prevents galvanic corrosion with brass and zinc-plated steel construction
  • Withstands 250 psi maximum operating pressure for reliable service
  • Operates from 33 to 180 degrees F for hot and cold lines
  • Polysulfone insulator and Buna-N gasket ensure dielectric isolation
  • 3 inch overall length fits standard 3/4 inch connections

Dielectric Union for Dissimilar Metals

The Watts 3/4 LF 3005-3/4A dielectric union connects 3/4 inch male NPT threads to a 3/4 inch male solder joint. It prevents galvanic corrosion between dissimilar piping metals in plumbing and hydronic heating systems. The union is rated for a maximum operating pressure of 250 psi.

Brass Body with Polysulfone Insulator

A brass body and zinc-plated galvanized steel nut provide mechanical strength while the polysulfone insulator electrically isolates the joint. The Buna-N gasket creates a reliable seal across the operating temperature range of 33 to 180 degrees F. These materials work together to maintain the dielectric break over time.

Compact Three-Inch Installed Length

At 3 inches overall length the union fits into tight piping runs without requiring extra clearance. Male threads on one end and a solder cup on the other allow direct transition between threaded and sweat connections. The design supports straightforward installation in new work or repair scenarios.

Highlights

  • Prevents galvanic corrosion with brass and zinc-plated steel construction
  • Withstands 250 psi maximum operating pressure for reliable service
  • Operates from 33 to 180 degrees F for hot and cold lines
  • Polysulfone insulator and Buna-N gasket ensure dielectric isolation
  • 3 inch overall length fits standard 3/4 inch connections

Specifications

TypeDrain Components
BrandWatts
Model3/4 LF 3005-3/4A

Questions about this item

Will the Buna-N gasket need periodic replacement?

The Buna-N gasket can degrade over time and should be inspected during routine system maintenance; replacement intervals depend on water chemistry and temperature cycling.

What pressure limit governs continuous operation?

The union is rated for a maximum operating pressure of 250 psi; sustained pressure at or near this value may accelerate gasket wear.

How hot does the polysulfone insulator get during all-day service?

The insulator is rated for continuous exposure up to 180 °F; in normal plumbing loops it remains close to the fluid temperature.

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