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Black dielectric union coupling, 1-1/2 inch T-574 model

Legend Valve

Legend Valve 301-337 1-1/2" T-574 Black Dielectric Coupling

SKU CH-9MW1-EE2HM

Connects 1-1/2" pipes with a dielectric union to prevent galvanic corrosion

  • Dielectric design prevents galvanic corrosion between dissimilar metals
  • 1-1/2 inch T-574 size fits standard plumbing connections
  • Black finish provides corrosion resistance in water systems
  • New condition ensures reliable performance from first installation
  • California Proposition 65 warning indicates chemical content disclosure

Product Identity

The Legend Valve 301-337 is a 1-1/2" T-574 black dielectric coupling designed for plumbing systems. It connects dissimilar metal pipes while preventing galvanic corrosion. The fitting is supplied new and intended for residential or commercial water installations.

Installation Check

Verify that both pipe ends measure 1-1/2" to match the coupling size. Confirm the existing pipe material is compatible with a dielectric union to avoid electrolytic reaction. Ensure adequate access for tightening the union nuts without damaging surrounding fittings.

Suitability

This coupling suits plumbers and maintenance teams joining copper to steel or iron in potable water lines. It is not for gas distribution, high-pressure steam, or systems requiring a different nominal diameter. Buyers needing threaded, sweat or push-fit ends not listed here should select an alternative fitting.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $33.99
Pricier than about 72% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameLEGEND VALVE

Questions about this item

Does the 1-1/2" T-574 Black Dielectric Coupling include any gaskets or pipe-sealant in the box?

The coupling is supplied as a single unit; gaskets, thread tape or pipe dope must be purchased separately.

When should I select the 1-1/2" T-574 Black Dielectric Coupling instead of a smaller or larger size?

Choose this 1-1/2 inch model when the piping system uses 1-1/2 inch nominal pipe threads; other sizes will not thread correctly.

How does the dielectric function of the T-574 coupling protect a water-heater installation?

The coupling breaks the electrical path between dissimilar metals, reducing galvanic corrosion that can shorten tank and pipe life.

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