We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Brass dielectric coupling with threaded ends, 1-1/4 inch size

Legend Valve

Legend Valve 301-536 1-1/4" T-578 Dielectric Coupling

SKU CH-DWXN-RSJHQ

Dielectric coupling prevents galvanic corrosion between dissimilar metals in plumbing systems

  • Prevents galvanic corrosion with dielectric coupling design
  • Fits 1-1/4 inch piping for standard plumbing connections
  • Legend Valve brand ensures reliable fitting performance
  • New condition guarantees unused, factory-fresh component
  • Model 301-536 T-578 identifies exact replacement part

1-1/4" T-578 Dielectric Coupling

This new dielectric coupling separates dissimilar metals in plumbing systems to reduce galvanic corrosion. It is designed for installers and maintenance teams working on potable water or hydronic lines where electrolysis protection is required. The 1-1/4 inch connection fits standard threaded pipe of that size.

California Proposition 65 Notices

The product carries two Proposition 65 warnings for chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. These notices do not alter the mechanical function of the coupling but inform handlers about material content. No additional accessories, sealants or software are bundled with the fitting.

Capacity and Service Limits

The coupling joins 1-1/4 inch threaded pipe in typical residential and light commercial water systems. It handles normal pressure and temperature ranges for dielectric unions of this class. It is not intended for gas service, steam lines or applications exceeding the pressure rating of the connected piping. Buyers needing larger diameters, flanged ends or certified lead-free markings must select a different model.

Highlights

  • Prevents galvanic corrosion with dielectric coupling design
  • Fits 1-1/4 inch piping for standard plumbing connections
  • Legend Valve brand ensures reliable fitting performance
  • New condition guarantees unused, factory-fresh component
  • Model 301-536 T-578 identifies exact replacement part

Specifications

BrandLEGEND VALVE

Questions about this item

Will the dielectric coupling itself need replacement, or only the internal gasket over time?

The coupling is a single brass-and-steel assembly with an integrated dielectric liner; no user-serviceable gasket is designed to be swapped, so the whole fitting is replaced if the liner degrades.

What pressure or temperature limit will be reached first during continuous hot-water circulation?

The T-578 dielectric coupling is rated for standard residential hot-water pressures and temperatures; the dielectric barrier remains effective up to the full service range of the brass body.

Does the fitting add measurable heat loss or noise when the system runs all day?

The coupling is a passive metal fitting with no moving parts; it adds no audible noise and its thermal mass is negligible compared with the surrounding piping.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.