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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

  • Product 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.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 70% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameWatts
Model name3/4 LF 3005-3/4A
Product typeDrain Components

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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