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Brass dielectric coupling with threaded ends, silver-grey finish

Legend Valve

Legend Valve 301-538 2" T-578 Dielectric Coupling

SKU CH-0REY-3SNJT

Connects 2-inch pipes while preventing galvanic corrosion between dissimilar metals

  • Prevents galvanic corrosion between dissimilar metals
  • 2-inch dielectric coupling isolates pipe connections
  • Legend Valve brand ensures reliable plumbing performance
  • California Proposition 65 warning for chemical exposure awareness
  • Model 301-538 T-578 designed for secure fit

2-inch T-578 Dielectric Coupling

This 2-inch T-578 dielectric coupling separates dissimilar metals in plumbing systems to reduce galvanic corrosion. It suits residential and light-commercial water lines where copper meets steel or iron pipe. The Legend Valve 301-538 model provides a reliable transition point for new installations or repair work.

Installation notes

The coupling threads onto standard 2-inch pipe ends using common wrenches and thread sealant. Ensure mating threads are clean and undamaged to prevent leaks. Over-tightening can crack the dielectric sleeve, while under-tightening leaves a weep path. California Proposition 65 warnings apply to chemicals in the product.

Capacity and limits

The fitting handles typical domestic hot and cold water pressures at the 2-inch nominal size. It is not rated for high-pressure hydronic loops, steam service, or industrial process piping beyond standard plumbing pressure ranges. Buyers needing larger diameters, flanged connections, or exotic alloy bodies must select a different fitting.

Highlights

  • Prevents galvanic corrosion between dissimilar metals
  • 2-inch dielectric coupling isolates pipe connections
  • Legend Valve brand ensures reliable plumbing performance
  • California Proposition 65 warning for chemical exposure awareness
  • Model 301-538 T-578 designed for secure fit

Specifications

BrandLEGEND VALVE

Questions about this item

How can I confirm the 2" T-578 Dielectric Coupling is working after installation?

Check for leaks at both connections while water flows through the system; a dry joint and normal pressure indicate the coupling is functioning as intended.

What comes in the box with the Legend Valve 301-538 coupling and what must be purchased separately?

The box contains the 2" T-578 dielectric coupling only; pipe sealant, thread tape, and any required adapters or tools are sold separately.

Which version of the Legend Valve dielectric coupling should I choose for a two-inch pipe?

Select the 2" T-578 model (part number 301-538) — it is the only size listed for two-inch plumbing connections.

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