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Brass dielectric union with female NPT and sweat connections

Legend Valve

Legend Valve 301-119NL 2-1/2 NL FXS T-571 Dielectric Union

SKU CH-428H-NQ1EJ

A 2-1/2 inch FNPT by sweat dielectric union that isolates dissimilar metals in plumbing systems

  • Dielectric union prevents galvanic corrosion between dissimilar metals
  • Lead-free construction meets potable-water safety standards
  • 2-1/2 inch FNPT by sweat connection fits copper and threaded pipe
  • T-571NL model designed for reliable dielectric isolation
  • California Proposition 65 warning for chemical exposure awareness

Legend Valve 301-119NL Dielectric Union

The Legend Valve 301-119NL is a dielectric union designed to connect dissimilar metal piping while preventing galvanic corrosion. It features a 2-1/2 inch female NPT thread on one end and a sweat connection on the other. The T-571NL model is constructed with no-lead brass components for potable water safety. This fitting suits plumbers and contractors joining steel pipe to copper tubing in water supply systems.

Installers joining dissimilar metals

This union fits professionals who need a reliable transition between threaded steel pipe and sweat copper without introducing electrolysis risk. It is not intended for systems requiring a threaded connection on both ends or for joining pipes of identical metal where a dielectric barrier is unnecessary. Buyers needing a different thread size or a press-fit connection should select an alternative fitting.

2-1/2 inch NPT to sweat capacity

The fitting comfortably handles standard residential and light commercial water pressures at the 2-1/2 inch nominal diameter. It runs out when the application demands a larger nominal size, a different thread standard, or a connection method other than female NPT to sweat. The no-lead brass construction provides headroom for potable water compliance where required.

Highlights

  • Dielectric union prevents galvanic corrosion between dissimilar metals
  • Lead-free construction meets potable-water safety standards
  • 2-1/2 inch FNPT by sweat connection fits copper and threaded pipe
  • T-571NL model designed for reliable dielectric isolation
  • California Proposition 65 warning for chemical exposure awareness

Specifications

BrandLEGEND VALVE

Questions about this item

What pipe thread and sweat sizes must my existing plumbing have to connect the 301-119NL dielectric union?

The union fits 2-1/2 inch FNPT threads on one side and a 2-1/2 inch sweat connection on the other, so both mating pipes must match those dimensions.

Will the T-571NL dielectric union protect my older copper and steel piping from galvanic corrosion when joined together?

Yes, the dielectric union separates dissimilar metals with an insulating barrier, preventing the electrochemical reaction that causes corrosion between copper and steel pipes.

How can I confirm the 301-119NL union is sealed and functioning after I install it?

Pressurise the system and inspect both the threaded and sweat joints for leaks; a dry, drip-free connection under normal operating pressure shows the union is working correctly.

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