Nibco 771-LF Class 150 Compani...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$212.09
Nibco 771-LF Class 150 Companion Flange C - Lead-Free* Bronze

Nibco 771-LF Class 150 Companion Flange C - Lead-Free* Bronze

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Model: B49510L

In Stock (leaves warehouse same day if ordered before 3pm ET)

$212.09
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The flange features a solder cup and flange face. This fitting provides a means for adapting a solder connection to a flange 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 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.

  • Lead-free*
  • Dezincification resistant
  • Silicon Performance Bronze® alloy
  • ASME B16.18 design standards
  • NSF/ANSI/CAN-61 and 372

Copper Fittings Installation Instructions

Manufacturer Resources

Product Specs

All Application(s):
Lead-Free
All Basic Material:
Lead-Free
Classification:
Solder Pressure Companion Flanges
End Connection:
Solder
Metal End Connection Type:
C x Flange
Product Group:
Fitting
Product Type:
Solder Pressure Companion Flanges
System Use:
Lead Free*, Commercial Plumbing, Fire Protection, Heating, HVAC, Industrial, Irrigation, Residential Plumbing
Product Subgroup:
Flange
Department:
Plumbing

Nibco B49510L – Frequently Asked Questions

1) What does a Nibco 771-LF companion flange connect to on each end?
One end is a solder cup that takes copper tube, and the other is a Class 150 flange face with bolt holes. It's the adapter you use when a copper line has to land on a flanged pump, valve, backflow assembly, or piece of equipment. Nibco calls the configuration C x Flange, so the tube side is sized for copper tube, not threaded pipe. If your run is threaded iron, this fitting is not the one, you'd want a threaded companion flange instead.
2) Will a Nibco 771-LF Class 150 flange bolt up to a cast iron or steel Class 150 flange on a pump?
Yes. Class 150 is a standardized flange class, so the bolt circle, bolt hole count and face diameter match any other Class 150 flange of the same nominal size regardless of what it's made of. Match the size, use the right gasket for the service, and it mates. The bronze body is what makes it suited to copper systems where you don't want a dissimilar metal joint right at the tube.
3) Do I get bolts, nuts and a gasket with a Nibco 771-LF companion flange?
No. You're buying the flange body only. A flanged joint needs a second mating flange (or the flanged port on your equipment), a gasket rated for the service, and a full set of bolts and nuts sized to the bolt circle. Order those separately, and remember a flange-to-flange joint between two companion flanges takes one gasket and one bolt set for the pair.
4) What is dezincification resistant bronze and why does it matter on a water flange?
Dezincification is when zinc leaches out of a brass alloy in aggressive or chlorinated water, leaving a weak, porous copper skeleton that eventually fails at the threads or the thinnest section. The 771-LF is cast in Nibco's Silicon Performance Bronze alloy, which is dezincification resistant, so it holds up in water chemistry that eats ordinary yellow brass. That's the reason it gets specified on municipal supply, reclaimed water and irrigation work where the water isn't gentle.
5) What design standard does the Nibco 771-LF flange meet for a submittal?
ASME B16.18 is the design standard on the 771-LF, which is the cast copper alloy solder joint pressure fittings standard. Paired with the Class 150 flange rating and the NSF/ANSI/CAN 61 and 372 potable water certifications, that's the line you put on a submittal for a spec'd job.
6) Should I use a companion flange or a union to connect copper to a pump?
Depends on the size and how often it comes apart. Up to about 2 inches a solder union is quicker and cheaper, but most pumps, backflow preventers and larger valves ship with a flanged port, and then you have no choice: a companion flange is the mating half. Above 2-1/2 inch, flanged is the normal way to make a serviceable break in a copper line. The 771-LF goes to 6 inch, so it covers the range where unions stop being practical.
7) Can I use the Nibco 771-LF bronze flange on a hydronic heating or chilled water line, not just domestic water?
Yes, it's used on heating and HVAC systems as well as commercial and residential plumbing, industrial process, irrigation and fire protection. Being bronze, it's a good match where the piping is copper and you want to avoid a steel-to-copper transition at the equipment. The lead-free certification is required on potable systems and does no harm on a closed loop.
How fast can I get the Nibco B49510L delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Nibco B49510L come with a warranty?
Absolutely. The Nibco B49510L is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Nibco B49510L?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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