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Small straight copper coupling with cup ends on both sides

Nibco, Inc.

Nibco, Inc. 600DS 1/4 in Straight Copper Coupling Cup 1/4 in FTG 1/4 in

SKU CH-B51J-HJ4QD

Straight copper coupling joins two 1/4 in tubes for air, gas or potable water up to 729 psi at 200 °F

  • Straight coupling joins two 1/4 in copper tubes
  • Wrot copper construction resists corrosion in potable water systems
  • Rated for 729 psi at 200 °F for high-pressure lines
  • Withstands temperatures up to 400 °F in hot-water applications
  • Sweat connection provides a permanent, leak-free joint

Copper Straight Coupling

The Nibco 600DS is a wrot-copper sweat fitting that joins two 1/4 inch copper tubes in a straight line. It suits installers working on air, gas or potable-water lines where a permanent, leak-tight joint is required.

Thermals Pressure Rating

The coupling withstands a maximum operating pressure of 729 psi at 200 degrees F and a maximum operating temperature of 400 degrees F. These limits cover typical residential and light-commercial plumbing and HVAC circuits without derating.

Replaces Compression Or Flared Joints

This soldered cup-to-cup fitting replaces mechanical couplings that can loosen over time or need periodic re-tightening. The jump is worthwhile when a permanent, code-compliant connection is preferred and the installer has basic brazing equipment.

Highlights

  • Straight coupling joins two 1/4 in copper tubes
  • Wrot copper construction resists corrosion in potable water systems
  • Rated for 729 psi at 200 °F for high-pressure lines
  • Withstands temperatures up to 400 °F in hot-water applications
  • Sweat connection provides a permanent, leak-free joint

Specifications

BrandNIBCO

Questions about this item

How do I sweat-solder this 1/4 in copper coupling and what step causes most leaks?

Clean both 3/8 in tube ends and the cup interiors with emery cloth, apply flux, insert fully, then heat the fitting evenly until solder flows into the joint; the common error is heating the tube instead of the cup, so solder never draws in.

What maintenance or replacement will this copper coupling need over time?

Copper sweat joints are permanent; inspect periodically for green corrosion or pinhole leaks caused by aggressive water chemistry, and replace the coupling only if a leak develops.

At what pressure or temperature limit does this coupling reach its maximum rating first during sustained use?

The coupling is rated for 729 psi at 200 °F and up to 400 °F maximum operating temperature; in most hot-water systems the 400 °F ceiling is reached before the pressure limit.

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