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Copper adapter trap with threaded and sweat connections

Nibco, Inc.

Nibco, Inc. U603 3/4" C x 3/4" FNPT Copper Adapter Trap

SKU CH-DARY-K4KDT MPN U603

Copper drain adapter connects 3/4 inch tube to female pipe thread, rated for 582 psi at 100 degrees F

  • TypeDrain Components
  • Wrot copper construction resists corrosion for long service life
  • C × FNPT connection joins tube to threaded pipe directly
  • Rated 582 psi at 100 °F for high-pressure systems
  • Operates from –20 °F to 400 °F across wide temperature range
  • Meets ASME/ANSI B 16.22 standard for reliable quality

Copper Adapter for 3/4" Lines

This Nibco U603 adapter connects a 3/4" nominal copper tube to a 3/4" FNPT threaded pipe fitting. It is designed for plumbing professionals and DIY installers joining dissimilar pipe types in residential or commercial drain, waste and vent systems. The wrot copper construction provides corrosion resistance and long service life in potable water applications.

Pressure and Temperature Headroom

The fitting is rated for a maximum pressure of 582 psi at 100 Degrees F and operates across a temperature range of -20 Degrees to 400 Degrees F. This headroom covers typical hot and cold water supply lines as well as low-pressure steam. The rating drops as temperatures approach the upper limit, so verify system conditions before specifying it for high-temperature service.

Build Integration Requirements

The adapter uses a C x FNPT connection type with a 7/8" outside diameter on the copper end, requiring standard soldering tools and flux for a leak-free joint. It conforms to ASME/ANSI B 16.22, ensuring dimensional compatibility with other listed fittings. No additional gaskets or sealants are needed on the solder side, while the threaded side accepts standard pipe dope or tape.

Highlights

  • Wrot copper construction resists corrosion for long service life
  • C × FNPT connection joins tube to threaded pipe directly
  • Rated 582 psi at 100 °F for high-pressure systems
  • Operates from –20 °F to 400 °F across wide temperature range
  • Meets ASME/ANSI B 16.22 standard for reliable quality

Specifications

TypeDrain Components
BrandNibco
ModelU603 3/4

Questions about this item

Will the 3/4" C x 3/4" FNPT copper adapter connect directly to my existing 3/4" copper pipe without extra fittings?

Yes, the wrought copper adapter uses a C x FNPT connection for 3/4 inch tube and pipe sizes with a 7/8 inch outside diameter for direct soldering to existing copper pipe.

How can I verify the adapter is holding pressure correctly after installation?

Pressure test the joint up to 582 psi at 100 degrees F; the fitting meets ASME/ANSI B 16.22 and operates from -20 to 400 degrees F.

Does the box contain thread sealant or solder for the FNPT and copper connections?

The package includes only the U603 copper adapter; thread sealant for the FNPT end and solder plus flux for the copper end must be purchased separately.

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