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The 90-degree union elbow features a solder cup, female NPT thread and union connection. The fitting provides a means of changing the pipeline direction 90 degrees, as well as adapting from a solder connection to a threaded connection. The union connection allows for the line to be repaired without damage. 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 Elbows
- End Connection:
- Threaded
- Fitting Bend Angle:
- 90 Deg (1/4 Bend)
- Metal End Connection Type:
- C x F (NPT)
- Product Group:
- Fitting
- Product Type:
- Solder Pressure Elbows
- System Use:
- Commercial Plumbing, Fire Protection, Heating, HVAC, Industrial, Irrigation, Residential Plumbing
- Type of Elbow:
- Straight Size;Threaded;Union
- Product Subgroup:
- Elbow
- Department:
- Plumbing
Nibco B068650 – Frequently Asked Questions
1) What connections does the Nibco 0707-3-6 union elbow have on each end?
One end is a solder cup that takes copper tube, the other is female NPT thread, and the fitting carries a union nut so the joint can be broken later. Nibco lists it as C x F (NPT). That makes it the fitting to use where you are turning 90 degrees and changing from sweat copper to threaded pipe or a threaded device at the same time.
2) Can I use this Nibco bronze union elbow on a potable water line?
No. Nibco states that use of this fitting in U.S. drinking water applications is prohibited after January 3, 2014. It is cast from ASTM B584 alloy C84400, which is not a lead-free potable alloy. Use it on non-potable service only, such as heating, HVAC, fire protection, irrigation or industrial lines, and specify a lead-free fitting for anything feeding a fixture people drink from.
3) What pipe sizes does the Nibco 0707-3-6 union elbow come in?
Three sizes: 1/2 inch, 3/4 inch and 1 inch. The size is straight through, meaning the solder end and the threaded end are the same nominal size on any given part, so a 3/4 inch unit sweats to 3/4 inch copper tube and threads to 3/4 inch NPT.
4) Why choose a union elbow instead of a plain 90 with a separate union?
It does two jobs in one body. A standard elbow is a permanent solder or threaded joint, so servicing the line downstream means cutting it out. The 0707-3-6 has the union built into the 90, so the nut breaks and the pipe comes apart with no damage to either leg. That matters at pumps, boilers, valves and anything you expect to pull for service. It also saves you the extra joint and the extra couple of inches a separate union would eat.
5) Is this Nibco fitting brass or copper, and will it hold up in a system with aggressive water?
It is a cast bronze fitting, ASTM B584 alloy C84400, and Nibco lists it as dezincification resistant, which is the property that stops zinc leaching out of the alloy and weakening the casting in aggressive or high chloride water. Material and workmanship are per ASME B16.18.
6) Can I solder this union elbow with the union nut assembled?
Take it apart first. The tailpiece with the solder cup should be separated from the nut and the threaded half before you put heat on it, so the seat and the nut threads do not get distorted or filled with solder. Sweat the cup to the tube, let it cool, then make up the union. Nibco publishes copper fittings installation instructions with the fitting for the full procedure.
7) What are the Nibco part numbers for the 0707-3-6 union elbow by size?
1/2 inch is B068550, 3/4 inch is B068600 and 1 inch is B068650. All three are the same 90 degree C x F union elbow, cast bronze, differing only in nominal size.
8) Is this union elbow suitable for a hydronic heating or chilled water loop?
Yes. Nibco lists heating, HVAC and industrial service among its applications, along with fire protection, irrigation and commercial plumbing. The union at the elbow is useful at circulator pumps and coil connections where you want a serviceable break right at the turn.
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Does the Nibco B068650 come with a warranty?
Absolutely. The Nibco B068650 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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