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Nibco 703-5-LF Special Drop Adapter C x F - Performance Bronze®
Model: NBC-703-5-LF
The special drop adapter features a solder cup, female NPT thread, and mounting ears. These fittings provide a means for adapting a solder connection to a threaded connection. The ears allow the...
Nibco
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$52.29
The special drop adapter features a solder cup, female NPT thread, and mounting ears. These fittings provide a means for adapting a solder connection to a threaded connection. The ears allow the fitting to be secured to a wall support using a nail or screw. 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 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
- Type of Adapter:
- Threaded;Drop-Ear;Straight Size
- Product Subgroup:
- Adapter
- Department:
- Plumbing
Nibco B029750 – Frequently Asked Questions
1) What does the Nibco 703-5 drop ear adapter connect to on each end?
One end is a solder cup that sweats onto copper tube, the other is a female NPT thread. Nibco lists the configuration as C x F (NPT), so you solder it to the tube run and thread your nipple, stub-out or valve into the other side. It is a straight size adapter, meaning the tube size and the thread size match.
2) What are the mounting ears on this drop ear adapter for?
They anchor the fitting to blocking or a wall support with a nail or screw, so the threaded outlet stays put when someone cranks a shower arm, hose bibb or tub spout into it. That is the whole point of a drop ear: the torque goes into the framing, not into your solder joint.
3) Can the Nibco 703-5 drop ear adapter be used on potable drinking water?
No. Nibco states that use in U.S. drinking water applications is prohibited after January 3, 2014. It is a cast bronze fitting to ASTM B584 alloy C84400, not a low-lead potable alloy. For a shower arm or tub spout on a domestic water line you need a lead-free drop ear adapter instead. This one belongs on non-potable work.
4) What size copper tube does the Nibco 703-5 fit?
Two sizes are made: 1/2 inch (MPN B029750) and 3/4 inch (MPN B029800). Being straight size, the 1/2 inch adapter takes 1/2 inch copper tube into the cup and 1/2 inch NPT on the thread; the 3/4 inch does the same at 3/4 inch.
5) What is the Nibco 703-5 adapter made of, and will it hold up in an aggressive water system?
Cast bronze, ASTM B584 alloy C84400, and Nibco calls it dezincification resistant, which matters on systems where brass fittings can lose zinc and fail. Material and workmanship follow ASME B16.18.
6) Do I need a drop ear adapter or will a plain copper female adapter do?
Use a plain C x F adapter when nothing will be torqued on later, such as a threaded valve mid-run. Use the 703-5 drop ear when the threaded end gets something that takes repeated force or has to stay dead flush with finished wall, like a shower arm or hose bibb. Only the drop ear gives you the screw or nail ears to fasten to blocking.
7) Where can a drop ear adapter like this be used besides plumbing?
Nibco lists it for commercial plumbing, fire protection, heating, HVAC, industrial, irrigation and residential plumbing. Common uses are anchoring a threaded outlet in a wall for hydronic and mechanical work, irrigation stub-outs, and similar non-potable service, since drinking water use is prohibited.
8) Do I need to protect anything when soldering the 703-5 drop ear adapter?
It is a solder cup fitting, so it gets sweated with heat. Standard practice is to solder the cup before threading anything into the female NPT side and keep the flame off the thread. Nibco publishes copper fittings installation instructions that cover the joint procedure.
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Can I return it if it doesn’t work for me?
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Nibco B029750 come with a warranty?
Absolutely. The Nibco B029750 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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