Nibco 5851-A Adjustable Closet...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$27.33
Nibco 5851-A Adjustable Closet Flange with Plastic Coated Steel Flange Hub - ABS DWV

Nibco 5851-A Adjustable Closet Flange with Plastic Coated Steel Flange Hub - ABS DWV

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Model: I355290

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

$27.33
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The ABS DWV adjustable closet flange features a plastic coated steel flange and a hub connection. 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 for evacuation of the used water. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information. Acrylonitrile-Butadiene-Styrene (ABS) is resistant to a wide variety of materials ranging from sewage to commercial household chemical formulations and can be exposed to a wide temperature span. ABS is lightweight, safe to handle and easy to install. ABS DWV is joined by solvent cementing or threading and can easily be connected to steel, copper, or cast iron through the use of transition fittings. NIBCO® plastic fittings are backed by a 5-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry.

  • Service temperature -40-DegreeF to 180-DegreeF
  • Do not test or use with compressed air or other gases
  • CSA B181.1
  • ASTM D2665
  • ASTM D3965
  • ASTM D2661 and D3311
  • UL Listed 94V-0
  • NSF/ANSI Standard 14

Plastic Fittings Installation Instructions

Manufacturer Resources

Product Specs

All Application(s):
DWV Drain / Waste / Vent
All Basic Material:
ABS - Acrylonitrile Butadiene Styrene
Classification:
ABS DWV Closet Flanges
End Connection:
Solvent Weld
Pipe Schedule:
40
Plastic End Connection Type:
H Hub
Product Group:
Fitting
Product Type:
ABS DWV Closet Flanges
System Use:
Commercial Plumbing, Residential Plumbing
Product Subgroup:
Closet Flange
Department:
Plumbing
Product Color:
Black
Product Length:
7 in
Country Of Origin:
United States
Product Width:
7 in

Nibco I355290 – Frequently Asked Questions

1) Will the Nibco 5851-A closet flange glue onto 4 inch ABS drain pipe?
Yes. The 5851-A closet flange is an ABS DWV fitting with a solvent weld hub connection, so the 4 inch version slips over and cements to 4 inch Schedule 40 ABS DWV pipe. There is no threading and no gasket involved, just ABS cement on the hub. A 4 inch x 3 inch version is also made, which lands the flange on a 3 inch stack.
2) My toilet drain is 3 inch pipe. Which Nibco 5851-A do I order?
Order the 4 inch x 3 inch, MPN I355350. The flange face stays the standard 4 inch toilet size while the hub takes 3 inch Schedule 40 ABS pipe, which is the usual arrangement on a 3 inch branch. If the closet bend under the floor is 4 inch, take the straight 4 inch instead, MPN I355290.
3) Can I use an ABS closet flange like the Nibco 5851-A on a commercial job, or is it residential only?
Both. The 5851-A is listed for commercial and residential plumbing, and it carries CSA B181.1, ASTM D2665, ASTM D3965, ASTM D2661 and D3311, UL Listed 94V-0, and NSF/ANSI Standard 14. Service temperature range is -40 F to 180 F on the DWV side. Check your local code before specifying, since some jurisdictions restrict ABS DWV in certain occupancies regardless of the listings.
4) Can I connect a Nibco ABS closet flange to an existing cast iron or copper drain?
Not directly. ABS DWV joins by solvent cement or threading, and connecting to steel, copper, or cast iron requires a transition fitting, which is a separate part you order alongside the flange. Cementing ABS to a dissimilar material is not a joint. Plan the transition below the floor and bring the 5851-A hub onto ABS pipe.
5) What does the adjustable part of the Nibco 5851-A closet flange actually do?
The steel ring rotates on the ABS body, so you can line the closet bolt slots up with the toilet after the hub is already cemented to the pipe. That matters when the stack comes up slightly out of square with the wall: you set the pipe first, then swing the ring to get the bolts parallel to the finished wall rather than trying to clock the fitting while the cement is still open.
6) Why is the ring on the Nibco 5851-A steel instead of all plastic?
The steel ring is what the closet bolts pull against. Plastic rings crack when a toilet is overtightened or when a heavy fixture gets rocked, which is the common failure in high traffic restrooms. The 5851-A uses a plastic coated steel ring on an ABS body, so the coating takes the corrosion duty and the steel takes the bolt load. If you are standardizing flanges across a building on ABS drainage, this is the version to spec for the busy rooms.
7) Can I pressure test an ABS DWV line with air after setting the closet flange?
No. Nibco states plainly that ABS DWV fittings are not to be tested or used with compressed air or other gases. Use a water test on the drainage system. An air test on plastic DWV can fail the fitting violently, and doing it voids the basis on which the fitting is rated.
8) Does the Nibco 5851-A closet flange come with closet bolts and a wax ring?
No. The 5851-A is the flange itself, black ABS body with the plastic coated steel ring. Closet bolts, the wax or foam seal, and any floor anchors are ordered separately. Budget for those on the same trip, plus ABS solvent cement for the hub joint.
9) Will ABS hold up to the drain cleaners and chemicals a janitorial crew pours down a toilet?
ABS resists a wide range of materials from sewage to commercial and household chemical formulations, which is the reason it is used for drainage in the first place. The 5851-A is solid ABS at the drain path, so what passes through the flange contacts ABS only. It also handles the temperature swing of a hot waste discharge within the -40 F to 180 F service range.
How fast can I get the Nibco I355290 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 I355290 come with a warranty?
Absolutely. The Nibco I355290 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 I355290?
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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