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Straight copper coupling with cup and spigot ends

Nibco, Inc.

Nibco, Inc. 905 Straight Copper Coupling Cup 2 in Spigot 2 in

SKU CH-DWPD-2PKB6

Straight copper coupling joins 2 in cup to 2 in spigot for potable water and air lines

  • Straight copper adapter joins 2 in tube to 2 in pipe
  • Wrot copper construction handles 400 °F and 5 psi
  • ASME B16.29 and ASTM B75 compliant for potable water
  • ISO 9001 quality system ensures consistent manufacturing
  • Sweat-fitting design suits air and water distribution systems

2-inch Straight Copper Adapter

The Nibco 905 straight adapter joins a 2-inch copper cup to a 2-inch spigot in potable water and air systems. It is built for installers who need a simple, code-compliant transition between tube and pipe of the same nominal size. The wrought copper construction meets ASME B16.29 and ASTM B75 standards for reliable sweat connections. This fitting is not for installers who require a reducing coupling or a threaded connection.

5 psi pressure rating and 400 °F limit

The adapter handles a maximum operating pressure of 5 psi and temperatures up to 400 degrees Fahrenheit. That headroom covers typical residential hot-water loops and low-pressure air lines with a comfortable margin. It runs out of rating in high-pressure hydronic mains or steam circuits where design pressures exceed the listed limit. The ISO 9001 manufacturing baseline supports consistent material quality across production runs.

Wrought copper body with cup and spigot ends

The straight body is made from wrought copper and presents a 2 1/8-inch outer diameter on both ends for standard sweat joints. Cup and spigot ends allow a direct soldered transition without extra fittings, reducing potential leak paths and installation time. The plain copper finish requires flux and solder on site; no threads, gaskets or mechanical clamps are involved. This fitting is not for technicians who need press-connect or push-fit compatibility.

Highlights

  • Straight copper adapter joins 2 in tube to 2 in pipe
  • Wrot copper construction handles 400 °F and 5 psi
  • ASME B16.29 and ASTM B75 compliant for potable water
  • ISO 9001 quality system ensures consistent manufacturing
  • Sweat-fitting design suits air and water distribution systems

Specifications

BrandNIBCO

Questions about this item

Will the 2 in cup and spigot ends of this 905 adapter mate with my existing 2 in copper pipe without extra fittings?

Both ends are sized for 2 in copper tube with a 2 1/8 in outer diameter, so the cup slides over the pipe and the spigot fits inside a standard 2 in copper fitting for a direct sweat connection.

How can I verify the joint is sound after soldering the cup and spigot ends?

Pressurise the line up to the 5 psi maximum operating pressure and inspect each sweat joint for leaks; the fitting is rated to 400 Degrees F, so normal soldering heat will not damage the wrot copper body.

Does the box include flux, solder or any installation hardware for the sweat connections?

The package contains only the straight copper adapter manufactured to ASME B 16.29 and ASTM B75; flux, solder and cleaning tools must be purchased separately.

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