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- The popular plumbing tips and advice forum and blog. Ask any toilet, sink, faucet, pump, water quality and plumbing related questions.
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Author:
luberhill (WV)
We are changing our toilet...it is a cast iron stink pipe 4", we have cut the cast iron pipe under the floor, we were going to put a pcv flange on and run 3" pcv to the 4" stink pipe. We probably could use 4" but is there any reason to or not to use 3" and furnco to the exsisting stink pipe ?
Cheers !
Jim
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Author:
hj
WHY do you HAVE to cut the cast iron pipe in the first place?
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Author:
luberhill (WV)
The flange was broken and my BIL messed it up so bad trying to get it off, if he had waited I was calling a plumber but , no he couldnt wait he knows how to fix it. You know the type, so now the cast is cut and here we are.
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Author:
hj
The typical case of a DIYer turning a 10 minute task into a minor remodel job. You can use 3" for the toilet, but you have to do it correctly and NOT use a rubber sleeve "fernco" coupling to do it.
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Author:
Doug E. (CA)
No reason to reduce. Use a 4" transition shielded band (Mission, torque to specs, and short piece of 4" PVC. You can glue your flange inside the 4" PVC. This is the pro method!
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Author:
luberhill (WV)
So if I understand this, get a pcv flange that will take a pc of 4" pcv, glue the short pc into the flange receiver, then connect the 4" pcv to my exsisting cast ?
Seems like every wax seal I se in HD or Lowes or even my local hdwr has the plastic horn, is this ok if I stay with 4" ??
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Author:
Doug E. (CA)
plastic horns lead to problems. Use a standard wax ring
Order of operations:
Do you have a clean cut/level on your cast iron? Build your transition piece first. Measure and cut the 4" PVC so that it is just flush with the floor (or just a hair below). Subtract 1/8" for the transition rubber. After you have tightened the band you can then glue in the PVC flange into the PVC riser piece making sure the holes on the flange are positioned square to the wall. Then use stainless or brass screws to secure the flange to the floor. Position your new wax ring without a horn on the flange, install your toilet and caulk.
Edited 2 times.
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Author:
luberhill (WV)
So if my flange sits on the finished floor a regular thin wax ring without the "horn" will work ?
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Author:
waukeshaplumbing (WI)
unless your redoing the whole 4" pipe to its source (drain stack)...odds are your doing something wrong...if the collar is broke you can snap the cast iron and replumb it, but why go 3" when the piping is 4"??? you cant reduce without a cleanout
i run 3" drains for toilets always...but if its already 4" i keep it 4" because its easier
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Author:
hj
quote; You can glue your flange inside the 4" PVC. This is the pro method!
It may be "A" pro method, but I have NEVER done it that way.
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Author:
hj
quote; you cant reduce without a cleanout
Where does THAT come from?
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Author:
luberhill (WV)
So is there a flange that glues inside 4" pcv and another that glues outside pcv ? I think its strange how we have differing opinions from the pro's.
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Author:
Doug E. (CA)
lots of ways to skin a cat
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Author:
jimmy-o (CA)
Yes there is a fitting which glues INSIDE a 4" pipe or OUTSIDE a 3" pipe.
[charlottepipe.com]
go to page 52, see item # 815
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Author:
packy
i would use a 4" no hub clamp with a 4x3 PVC bushing in it.
3" is adequately sized for up to 3 toilets. why spend extra money for 4" ???
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Author:
hj
It depends on how we learned the trade. We ALL think our way is the best.
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Author:
hj
I always install my flange OUTSIDE a 4" pipe, but use the one that goes inside when I have to repair someone's failed outside flange. If THEY used an inside one and it goes bad, then I have a major repair to do for the customer.
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