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The closet flange features a solder cup and closet flange face. The closet flange is secured to the floor of the dwelling so that a toilet can be affixed to it and allow for a pipe connection (under the floor) to continue the piping evacuation of the used water. 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 B75 Alloy C12200
- Material and workmanship per ASME B16.29
Copper Fittings Installation Instructions
Manufacturer Resources
Product Specs
- All Application(s):
- DWV Drain / Waste / Vent
- All Basic Material:
- Copper
- Classification:
- Solder DWV Closet Flanges
- End Connection:
- Solder
- Metal End Connection Type:
- C
- Product Group:
- Fitting
- Product Type:
- Solder DWV Closet Flanges
- System Use:
- Commercial Plumbing, Residential Plumbing
- Product Subgroup:
- Closet Flange
- Department:
- Plumbing
- Product Length:
- 6.75 in
- Product Width:
- 6.75 in
- Product Height:
- 1.69 in
- Product Weight:
- 0.842 lb
- Country Of Origin:
- United States
Nibco H355250 – Frequently Asked Questions
1) What size pipe does the Nibco 951 copper closet flange connect to?
The Nibco 951 wrot copper DWV closet flange is made in a 4 inch by 3 inch configuration, meaning a 4 inch flange face over a 3 inch solder cup. If your under-floor stack is 3 inch copper DWV, this is the fitting that ties the toilet to it. For a 4 inch copper riser you would need a 4 x 4 flange instead.
2) Is the Nibco 951 closet flange soldered or does it glue on like PVC?
It solders. The 951 has a solder cup end (connection type C, meaning copper tube size cup), so it is sweated onto copper DWV tube with flux and solder. There is no solvent weld and no gasket, so plan on a torch and a dry joint at the time of install. Nibco publishes copper fitting installation instructions for the joining procedure.
3) Can I use a copper closet flange on a commercial job or is it residential only?
Both. The 951 is listed for commercial and residential plumbing service, on DWV drain, waste and vent systems. It is common in institutional and multi-family work where the existing stack is copper and inspectors want a like-material connection rather than a transition to plastic.
4) What copper alloy and standard is the Nibco 951 flange made to?
It is wrot copper, ASTM B75 alloy C12200, with material and workmanship per ASME B16.29. It is also dezincification resistant. Those are the two callouts a spec engineer looks for on a copper DWV fitting submittal.
5) Does the Nibco 951 closet flange come with closet bolts, a wax ring, or floor screws?
No. The 951 is the flange casting only, with a solder cup below and a closet flange face on top. You supply the closet bolts, the wax or foam seal, and the fasteners that anchor the flange to the floor. Order those separately so the toilet set does not stall.
6) How does a copper closet flange get anchored to the floor?
The flange face is fastened down to the floor of the dwelling so the toilet can be bolted to it, while the solder cup below carries the waste into the under-floor piping. Get the flange face bearing on finished floor level before you sweat the joint, because once it is soldered you cannot rotate or reset the height.
7) Why choose copper over a plastic closet flange for a green building project?
Copper is reusable at end of life, which is why it scores well on sustainable projects, and it holds up without much maintenance. Nibco copper fittings like the 951 are made in an ISO 9001 certified facility. If the existing stack is already copper DWV, staying in copper also avoids a dissimilar-material transition at the floor.
8) What is the manufacturer part number for the Nibco 951 closet flange in 4 x 3?
The 4 inch by 3 inch Nibco 951 wrot copper DWV closet flange carries MPN H355250. That is the number to quote when matching a submittal or reordering for a repeat job.
How fast can I get the Nibco H355250 delivered?
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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 H355250 come with a warranty?
Absolutely. The Nibco H355250 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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