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Copper reducing adapter with threaded and smooth ends

Nibco, Inc.

Nibco, Inc. 603R Reducing Adapter CxFNPT 1-1/4x1-1/2in HAWA

SKU CH-YAAG-Z8YHM MPN 603R

A copper reducing adapter joins 1-1/4 in tube to 1-1/2 in female pipe thread, rated to 439 psi at 100 degrees F

  • TypeDrain Components
  • MaterialHAWA
  • Reduces pipe size with wrot copper durability
  • Handles up to 439 psi at 100 degrees F
  • Operates from -20 to 400 degrees F
  • Meets ASME/ANSI B 16.22 standard
  • C x FNPT connection fits 1-1/4 in tube to 1-1/2 in pipe

Reducing Adapter 1-1/4x1-1/2in CxFNPT

The Nibco 603R is a wrot copper reducing adapter designed to join 1-1/4 inch tube to a 1-1/2 inch female NPT thread. It suits plumbing installations where a transition between dissimilar pipe sizes is required. The C x FNPT connection type provides a reliable mechanical joint for drain and trap assemblies.

Thermals and pressure rating

The fitting withstands a maximum pressure of 439 psi at 100 degrees F and operates across a temperature range of -20 to 400 degrees F. Wrot copper construction resists corrosion and handles thermal cycling without degradation. No moving parts or powered components are present, so noise and power draw are not applicable.

Build integration

The adapter connects directly to 1-1/4 inch copper tube on the C end and accepts 1-1/2 inch male NPT threads on the FNPT end. Compliance with ASME/ANSI B 16.22 ensures dimensional compatibility with standard fittings. Installers must supply compatible tube, thread sealant and support hardware to complete the joint.

Highlights

  • Reduces pipe size with wrot copper durability
  • Handles up to 439 psi at 100 degrees F
  • Operates from -20 to 400 degrees F
  • Meets ASME/ANSI B 16.22 standard
  • C x FNPT connection fits 1-1/4 in tube to 1-1/2 in pipe

Specifications

TypeDrain Components
MaterialHAWA
BrandNibco
Model603R 11/4x11/2

Questions about this item

How do I install the 603R reducing adapter with its 1-1/4 in tube and 1-1/2 in pipe ends?

Clean the 1-1/4 in copper tube end and the 1-1/2 in FNPT threads, apply flux to the tube and thread sealant to the FNPT, then solder the C connection and tighten the FNPT joint; the step often missed is using a lead-free solder rated for the 439 psi pressure rating at 100 Degrees F.

What maintenance or replacement will the wrot copper adapter need over time?

Inspect the soldered C joint and FNPT threads annually for green corrosion or weeping; replace the adapter if dezincification appears on the wrot copper body or if threads strip during re-tightening, as the material cannot be repaired once degraded.

Which limit appears first when the 603R runs continuously at high temperature?

The 400 Degrees F upper temperature limit is reached before the 439 psi pressure rating becomes critical, so sustained service near 400 Degrees F requires pressure derating per ASME B16.22 to avoid joint failure.

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