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Copper reducing adapter, cylindrical, shiny metallic finish

Nibco, Inc.

Nibco, Inc. 603R Reducing Adapter, Wrot Copper, C x FNPT, 3/4 x 1 In

SKU CH-TY0X-8STTK MPN 603R

A wrot-copper reducing adapter joins 3/4-inch tubing to a 1-inch female pipe thread and withstands 582 psi at 100 °F

  • TypeDrain Components
  • Reduces pipe size for flexible installations
  • Wrot copper construction resists corrosion
  • Rated to 582 psi at 100°F for durability
  • Operates from -20°F to 400°F reliably
  • Meets ASME/ANSI B16.22 standards

Reducing Adapter for Copper Pipework

The Nibco 603R is a wrot copper reducing adapter designed to join a 3/4 inch copper tube to a 1 inch female NPT thread. It suits plumbing and heating installers who need a reliable transition between dissimilar pipe sizes in residential or light commercial systems. The C x FNPT connection type allows direct soldering to copper tube on one end and a standard threaded joint on the other.

Sustained Pressure and Temperature Performance

Rated for a maximum working pressure of 582 psi at 100 degrees F, the fitting maintains integrity under continuous system pressure. Its operational temperature range spans from -20 degrees to 400 degrees F, covering chilled water, domestic hot water and low-pressure steam lines without degradation. The wrot copper construction resists corrosion and thermal cycling stress over long service periods.

Replaces Mismatched Threaded Bushings

This adapter eliminates the need to combine separate bushings and couplings when stepping from 3/4 inch copper tube to 1 inch pipe threads. The single-piece design reduces potential leak paths and cuts installation time compared to multi-fitting assemblies. The jump is worth it whenever a clean, code-compliant transition to ASME/ANSI B16.22 is required between these specific sizes.

Highlights

  • Reduces pipe size for flexible installations
  • Wrot copper construction resists corrosion
  • Rated to 582 psi at 100°F for durability
  • Operates from -20°F to 400°F reliably
  • Meets ASME/ANSI B16.22 standards

Specifications

TypeDrain Components
BrandNibco
Model603R 3/4x1

Questions about this item

Does the copper adapter get hot or noisy when water runs through it continuously?

The wrot copper body has no moving parts and produces no noise; it operates within a temperature range of -20 to 400 degrees F without generating heat of its own.

What existing pipe and tube sizes must I already have to use this 3/4 x 1 inch reducing adapter?

You need a 3/4 inch copper tube for the C end and a 1 inch female NPT threaded pipe for the FNPT end to make the connection.

Will this ASME B16.22 adapter thread onto older 1 inch NPT plumbing without leaks?

Yes, the FNPT threads follow ASME/ANSI B16.22 and are rated to 582 psi at 100 degrees F, matching standard 1 inch NPT fittings.

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