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Black dielectric union fitting with threaded ends

Legend Valve

Legend Valve 301-338 2" T-574 Black Dielectric Coupling

SKU CH-E5B8-QBQBE

Connects dissimilar metal pipes while preventing galvanic corrosion with a 2-inch dielectric union

  • 2" dielectric union prevents galvanic corrosion between dissimilar metals
  • T-574 black finish identifies the coupling for quick system checks
  • 301-338 model code simplifies reordering and inventory tracking
  • Legend Valve brand signals established plumbing-component manufacturing
  • Ships direct from manufacturer on orders of $75 or more

2" T-574 Black Dielectric Union

The Legend Valve 301-338 is a 2-inch dielectric union designed to join dissimilar metal piping while preventing galvanic corrosion. It is suited for plumbing professionals and maintenance teams who need a reliable transition fitting for water supply systems.

Installers separating copper from steel

This coupling serves installers who must connect copper tubing to steel or iron pipe without direct metal contact. It is not intended for applications requiring a straight coupling between identical metals or for gas service unless local codes specifically approve this model for that use.

Handles standard residential

The 2-inch nominal size accommodates common supply lines found in residential and light commercial installations. It runs out when the piping system demands a larger nominal diameter or a pressure rating beyond the standard class for this union configuration.

Highlights

  • 2" dielectric union prevents galvanic corrosion between dissimilar metals
  • T-574 black finish identifies the coupling for quick system checks
  • 301-338 model code simplifies reordering and inventory tracking
  • Legend Valve brand signals established plumbing-component manufacturing
  • Ships direct from manufacturer on orders of $75 or more

Specifications

BrandLEGEND VALVE

Questions about this item

What pipe size and thread type does the 2" T-574 dielectric union need to connect to?

The union is a 2-inch T-574 black dielectric coupling designed to join pipes with matching 2-inch threads, preventing galvanic corrosion between dissimilar metals.

Will this dielectric union work with my existing copper and steel plumbing?

Yes, the 2" T-574 black dielectric union separates copper and steel piping electrically, stopping the corrosion that occurs when those metals contact water together.

How can I confirm the 301-338 union is sealing properly after installation?

Pressurise the system and check the joint for leaks; a correctly seated dielectric union shows no water escaping at the 2-inch connection points.

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