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The female adapter features a flared connection and a female NPT thread. The fitting provides a means for adapting a flare 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.
- Dezincification resistant
- Use in U.S. drinking water applications is prohibited after January 3, 2014
- ASTM B584 Alloy C84400
- Material and workmanship per ASME B16.26
Manufacturer Resources
NIBCO Copper Fittings Catalog
Product Specs
- All Basic Material:
- Bronze
- Classification:
- Flared Pressure Adapters
- End Connection:
- Threaded
- Metal End Connection Type:
- FL x F
- Product Group:
- Fitting
- Product Type:
- Flared Pressure Adapters
- System Use:
- Commercial Plumbing, Irrigation, Residential Plumbing
- Type of Adapter:
- Straight Size;Threaded
- Product Subgroup:
- Adapter
- Department:
- Plumbing
Nibco 6026300 – Frequently Asked Questions
1) What connections are on the Nibco 503 flared adapter?
One end is a flare connection and the other is female NPT pipe thread, designated FL x F. It lets you take a flared tubing run into threaded pipe or into a threaded port on a valve or appliance.
2) Can I use the Nibco 503 flared female adapter on potable drinking water?
No. The 503 is a cast bronze flare adapter whose use in U.S. drinking water applications is prohibited after January 3, 2014. Use it on non-potable work only, such as irrigation or mechanical lines, and pick a lead-free adapter for potable service.
3) What sizes does the Nibco 503 flare to female thread adapter come in?
Four sizes: 1/2 inch (MPN 6025450), 3/4 inch (6026000), 1 inch (6026300) and 1-1/2 inch (6026750). All are straight size, meaning the flare end and the thread end match, so there is no reducing version.
4) What material is the Nibco 503 adapter made from, and will it hold up in aggressive water?
Cast bronze, ASTM B584 Alloy C84400, and it is dezincification resistant, so it holds up better than brass in water chemistry that leaches zinc out of yellow brass fittings.
5) Does the Nibco 503 meet flare fitting dimensional standards for an inspected job?
Material and workmanship are per ASME B16.26, the standard covering cast copper alloy fittings for flared copper tube, which is the reference an inspector or spec writer looks for on a flare adapter.
6) Is a flare adapter or a solder adapter the better choice for connecting copper tube to threaded pipe?
Flare, like the 503, is the choice where you cannot or should not bring a torch to the joint, and where the connection may need to come apart again later. It is a mechanical joint made by flaring the tube end and drawing it up with a nut, so no heat or flux is involved. A solder or press adapter is faster for long runs of rigid copper in open walls. Flare is common on soft copper in irrigation and on gas or appliance drops.
7) Does the Nibco 503 come with a flare nut, or do I need to order one separately?
The 503 is the adapter body only, a flare end and a female threaded end. The flare nut that draws the flared tube onto the seat is a separate item, so order the matching nut in the same size as the fitting.
8) Is the Nibco 503 flare adapter suitable for irrigation and commercial plumbing systems?
It is listed for commercial plumbing, residential plumbing and irrigation service. Given the drinking water restriction on the cast bronze alloy, irrigation and other non-potable lines are where it fits best.
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Does the Nibco 6026300 come with a warranty?
Absolutely. The Nibco 6026300 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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