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The 90-degree double elbow features solder cups. The fitting provides a means of changing the pipelines direction 90 degrees in two directions. 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
- ASTM B584 Alloy C84400
- Material and workmanship per ASME B16.23
Copper Fittings Installation Instructions
Manufacturer Resources
Product Specs
- All Application(s):
- DWV Drain / Waste / Vent
- All Basic Material:
- Bronze
- Classification:
- Solder DWV Elbows
- End Connection:
- Solder
- Fitting Bend Angle:
- 90 Deg (1/4 Bend)
- Metal End Connection Type:
- C x C
- Product Group:
- Fitting
- Product Type:
- Solder DWV Elbows
- System Use:
- Commercial Plumbing, Residential Plumbing
- Product Subgroup:
- Elbow
- Department:
- Plumbing
Nibco E285400 – Frequently Asked Questions
1) What is a DWV double 90 elbow actually used for on a drain line?
The Nibco 837 is a 90-degree (1/4 bend) double elbow with three solder cups, so it turns the line 90 degrees in two directions from a single fitting. Typical use is picking up two fixture drains or vent branches off one run without stacking two separate quarter bends. It is a DWV drain, waste and vent fitting, not a pressure fitting.
2) What sizes does the Nibco 837 double elbow come in?
Three configurations: 1-1/2 inch all around (E285300), 2 inch all around (E285400), and a reducing 2 x 1-1/2 x 1-1/2 inch (E285450). The reducing version is the one to use when a 2 inch main run picks up two 1-1/2 inch branches, so you don't need bushings at the cups.
3) Does this fitting solder onto standard copper DWV tube?
Yes. All three openings are C x C solder cups, so they slip over the outside of copper tube and are joined with solder or brazing filler. No threads and no press or grooved ends. Material and workmanship follow ASME B16.23, the DWV solder fitting standard.
4) Can I use the 837 double elbow on a water supply line instead of drainage?
No. It is built for DWV drain, waste and vent service only. DWV fittings have thinner walls and shallower cups than pressure fittings, so for potable or hydronic supply you want a standard pressure-rated copper elbow or tee instead.
5) Is the Nibco 837 cast bronze or wrought copper?
Cast bronze, ASTM B584 alloy C84400, and dezincification resistant. Cast bodies are what you get on DWV double-outlet patterns like this because the geometry can't be formed from wrought tube.
6) What do I need to order the right 837 for a 2 inch stack with two 1-1/2 inch branches?
Order the reducing 2 x 1-1/2 x 1-1/2 inch version, MPN E285450. The straight 2 inch (E285400) has all three cups at 2 inch, which would leave you reducing at each branch with extra couplings and adapters.
7) Is this fitting acceptable on a commercial job or is it residential only?
Both. Nibco lists the 837 for commercial and residential plumbing systems, and the copper fittings are made in an ISO 9001 certified facility with material and workmanship per ASME B16.23.
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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 E285400 come with a warranty?
Absolutely. The Nibco E285400 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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