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The female adapter features a solder cup and female NPT thread. These fittings provide a means for adapting a solder connection to a threaded connection. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. NIBCO® copper fittings are manufactured in an ISO 9001 certified facility, and backed by a 50-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry.
Copper Fittings Installation Instructions
- Dezincification resistant
- Use in U.S. drinking water applications is prohibited after January 3, 2014
- ASTM B584 Alloy C84400
- Material and workmanship per ASME B16.18
Copper Fittings Installation Instructions
Manufacturer Resources
Product Specs
- All Basic Material:
- Bronze
- Classification:
- Solder Pressure Adapters
- End Connection:
- Threaded
- Metal End Connection Type:
- C x F (NPT)
- Product Group:
- Fitting
- Product Type:
- Solder Pressure Adapters
- System Use:
- Commercial Plumbing, Fire Protection, Heating, HVAC, Industrial, Irrigation, Residential Plumbing
- Product Subgroup:
- Adapter
- Department:
- Plumbing
Nibco B026550 – Frequently Asked Questions
1) Can I use the Nibco 703 copper female adapter on potable water lines?
No. The 703 female adapter is cast from bronze alloy C84400, and use in U.S. drinking water applications has been prohibited since January 3, 2014. For potable work you need a lead-free adapter. The 703 is still fine for the non-potable systems it's listed for: fire protection, heating, HVAC, industrial, irrigation, and non-potable commercial or residential plumbing lines.
2) How do the two ends on a Nibco 703 adapter connect?
It's a C x F fitting: one end is a solder cup that slips over copper tube and gets sweated with solder, the other is a female NPT thread that takes a male threaded pipe or nipple. So it's the transition piece when you need to get off copper and onto threaded pipe, valves, or equipment connections.
3) Does the Nibco 703 come in sizes where the copper and thread size don't match?
Yes, and that's most of the range. Reducing and increasing combinations include 1/2 x 1 inch, 3/4 x 1-1/4, 3/4 x 3/8, 1 x 1-1/2, 1-1/4 x 2, 1-1/4 x 3/4, 1-1/2 x 2, 1-1/2 x 1-1/4, and 2 x 1-1/4 inch. The first figure is the copper tube size and the second the NPT thread. Straight sizes are offered at 2-1/2, 3, and 4 inch. Pick the combination rather than adding a separate bushing.
4) Will the threads on this adapter crack over time in a hard-water or aggressive water system?
The 703 is made from a dezincification resistant bronze, which is the property that guards against zinc leaching out of the alloy and weakening the fitting in aggressive water. That matters most on the threaded end, where wall sections are thinnest. Material and workmanship follow ASME B16.18.
5) Is a cast bronze female adapter better than a wrought copper one for a threaded connection?
For a female NPT end, cast bronze like the 703 is the usual choice. Casting gives you the heavier wall and thread engagement a threaded joint needs, which is why the thread-bearing adapters in a copper system are bronze while the elbows and couplings are wrought copper. If both ends of your transition are solder cups, you don't need a cast fitting at all.
6) Can I use the Nibco 703 on a fire sprinkler or hydronic heating line?
Yes on both. The 703 adapter's listed system uses cover fire protection, heating, and HVAC, along with industrial, irrigation, and commercial plumbing. It's a solder pressure adapter, so the copper side is a sweated joint rated for pressure service, not a drainage fitting.
7) Do I need thread sealant with the Nibco 703 female adapter, and should I thread it before or after soldering?
The NPT thread is a tapered pipe thread and needs tape or pipe dope on the male half to seal; the machined thread alone won't. Solder the copper cup first and let the fitting cool before you make up the threaded joint, so you aren't putting torch heat on a sealed thread. Nibco publishes copper fitting installation instructions for the soldering procedure.
8) What part number do I order for a 3/4 inch copper to 1-1/4 inch NPT female adapter?
That's Nibco MPN B025000. Other common ones in the 703 line: B024700 for 1/2 x 1 inch, B025300 for 1 x 1-1/2, B025600 for 1-1/4 x 2, B026000 for 1-1/2 x 1-1/4, B026450 for 2-1/2 inch, and B026850 for 4 inch.
9) Is the Nibco 703 approved for a LEED or sustainable-build project?
It suits copper-system specs on sustainability grounds: copper is reusable at end of life, and these fittings are produced in an ISO 9001 certified facility. Just note the potable water restriction, so on a green project it belongs on hydronic, HVAC, irrigation, or fire protection piping rather than domestic water.
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Does the Nibco B026550 come with a warranty?
Absolutely. The Nibco B026550 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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