Nibco 4855 Closet Flange with ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$13.50
Nibco 4855 Closet Flange with Knockout Test Plug Hub - PVC DWV

Nibco 4855 Closet Flange with Knockout Test Plug Hub - PVC DWV

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Model: K440100

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

$13.50
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The PVC DWV closet flange features a knockout test plug 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. Polyvinyl chloride (PVC) is the most frequently specified of all thermoplastic materials because of its light weight, durability, and cost-effectiveness. PVC DWV is easy to install and is joined by solvent cementing or threading. PVC fittings exhibit high corrosion and chemical resistance and will not rust, scale, pit or corrode. 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.

  • Maximum service temperature 140-DegreeF
  • Do not test or use with compressed air or other gases
  • ASTM D2665 and D3311
  • NSF/ANSI Standard 14
  • NSF U.P. Certified

Plastic Fittings Installation Instructions

Manufacturer Resources

NIBCO Plastic Fittings Catalog

Product Specs

All Application(s):
DWV Drain / Waste / Vent
All Basic Material:
PVC - Polyvinyl Chloride
Classification:
PVC DWV Closet Flanges
End Connection:
Solvent Weld
Pipe Schedule:
40
Plastic End Connection Type:
H Hub
Product Group:
Drains and Cleanouts
Product Type:
PVC DWV Closet Flanges
System Use:
Commercial Plumbing, Residential Plumbing
Product Subgroup:
Flashing and Flanges
Department:
Plumbing
Product Color:
White
Product Length:
7 in
Country Of Origin:
United States
Product Width:
7 in
Product Weight:
0.81 lb
Product Height:
2.75 in

Nibco K440100 – Frequently Asked Questions

1) Does the Nibco 4855 closet flange fit 3 inch or 4 inch drain pipe?
The Nibco 4855 is a 4 inch by 3 inch closet flange: the flange body is 4 inch and the hub drops down to accept 3 inch Schedule 40 PVC DWV pipe. So it sets a standard toilet over a 3 inch waste line. If your stack under the floor is 4 inch, this is not the fitting you want.
2) What is the knockout test plug on this Nibco closet flange for?
It lets you pressure test the DWV system before the toilet goes on. The integral knockout plug seals the drain during the water test, then you punch it out when you are ready to set the fixture. Note the caution that comes with it: do not test or use the system with compressed air or other gases, water test only.
3) Can I use the Nibco 4855 PVC closet flange on a commercial job, and does it meet plumbing code standards?
It is listed for both commercial and residential plumbing. The fitting is made to ASTM D2665 and D3311, carries NSF/ANSI Standard 14, and is NSF U.P. Certified, which is the listing most inspectors look for on DWV fittings.
4) Will this PVC closet flange handle hot water or a steam line?
No. Maximum service temperature is 140 degrees F, and the fitting is intended for drain, waste and vent service only. It is fine for normal fixture discharge from a toilet, but it is not a pressure fitting and it should not see sustained high temperature flow.
5) Does the Nibco 4855 closet flange come with a metal ring or the bolts to set the toilet?
It is an all-PVC flange, white, with no metal ring. Closet bolts, the wax ring or seal, and the floor anchors are separate items you need to pick up with it. If your spec calls for a stainless or galvanized ring flange for extra pull-out strength, this one will not satisfy that.
6) Why choose a PVC closet flange over cast iron or ABS for a multi-family remodel?
PVC is the usual call on DWV work because it is light, easy to cut and cement, and will not rust, scale, pit or corrode the way metal will under a wet bathroom floor. The tradeoff is the 140 degree F ceiling and the fact it must be solvent welded, so it joins to PVC pipe, not to ABS with the same cement and not to cast iron without a transition coupling.
How fast can I get the Nibco K440100 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 K440100 come with a warranty?
Absolutely. The Nibco K440100 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 K440100?
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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