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Copper reducing adapter with threaded and smooth ends

Nibco, Inc.

Nibco, Inc. 604R Reducing Adapter Trap

SKU CH-YNR6-8W9RV MPN 604R

Wrot copper reducing adapter joins 1-inch tube to 1-1/4-inch MNPT, rated to 494 psi at 100 °F and -20 to 400 °F per ASME/ANSI B16.22

  • Product typeDrain Components
  • Main materialHAWA
  • Reduces joint count with 1 in to 1-1/4 in step
  • Wrot copper resists corrosion across -20 to 400 °F
  • Rated 494 psi at 100 °F for high-pressure lines
  • ASME/ANSI B 16.22 compliant for code acceptance
  • C x MNPT ends connect tube to pipe without extra fittings

Copper reducing adapter for plumbing

This Nibco 604R reducing adapter connects a one-inch copper tube to a one-and-a-quarter-inch male NPT thread. The wrought copper construction meets ASME/ANSI B 16.22 standards for drain components. It is designed for professional plumbing installations requiring a secure transition between dissimilar pipe sizes. The fitting handles a maximum pressure of 494 psi at 100 degrees Fahrenheit.

Suits installers joining copper tube to threaded

This adapter fits projects where a one-inch copper line must join a larger threaded fitting in drain or water systems. The temperature range from minus 20 to 400 degrees Fahrenheit covers hot and cold applications. Builders needing a straight coupling or a different size transition should look at other fittings. It does not serve as a trap or a drainage assembly on its own.

Performs reliably under sustained pressure and heat

The wrought copper body maintains its seal across the full rated temperature span without softening. At the maximum 494 psi the joint resists creep during long-term service. Thermal cycling between freezing and high heat does not degrade the mechanical connection. The fitting remains dimensionally stable under continuous load rather than only brief test bursts.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 76% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameNibco
Model name604R 1 × 11/4
Product typeDrain Components
Size & build
Main materialHAWA

Questions about this item

What copper tube size must I already have to connect this 604R adapter?

The fitting accepts a 1 in copper tube on the C end, so you need that exact tube diameter for a proper sweat joint.

Will the 1-1/4 in MNPT thread on this adapter mate with my existing 1-1/4 in pipe fittings?

Yes, the MNPT side is sized at 1-1/4 in and follows ASME/ANSI B 16.22, matching standard 1-1/4 in pipe threads you may already have.

How can I confirm the joint is sound after soldering and threading the adapter?

Pressurise the line up to 494 psi at 100 Degrees F; if no leaks appear across the -20 to 400 Degrees F range, the installation is working as intended.

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