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Old 12-21-2012, 01:32 PM   #1
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toilet pipe


hello, i am installing my toilet and the ground pipe is 3 7/8 inch and all i can find is 3 or 4 inch flange's. from what i hear the flange is suppose to go inside the pipe so the 4 inch is too big and the 3 is too small. anybody come across this before?

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Old 12-21-2012, 01:51 PM   #2
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A 4-inch flange should work just fine.


Last edited by md2lgyk; 12-21-2012 at 01:53 PM.
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Old 12-21-2012, 01:53 PM   #3
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hello, i am installing my toilet and the ground pipe is 3 7/8 inch and all i can find is 3 or 4 inch flange's. from what i hear the flange is suppose to go inside the pipe so the 4 inch is too big and the 3 is too small. anybody come across this before?
Seems to be an odd size- can you upload a picture? What is the pipe made of-plastic, cast iron, lead, copper?
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Old 12-21-2012, 01:57 PM   #4
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Seems to be an odd size- can you upload a picture? What is the pipe made of-plastic, cast iron, lead, copper?
made of plastic
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Old 12-21-2012, 02:01 PM   #5
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A 4-inch flange should work just fine.
but how do i get a 4inch flange into the 3 7/8 inch pipe? i also thought maybe putting the flange on the outside of the pipe but wont it leak?
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Old 12-21-2012, 02:23 PM   #6
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You will be priming and gluing this---outside flanges are always the first choice

There are several 'plastics' used for pipe--all use a special glue (solvent) describe the pipe,please---
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Old 12-21-2012, 05:41 PM   #7
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you should be able to glue a 3" hub closet flange into the 4" pipe..ben sr
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Old 12-21-2012, 06:35 PM   #8
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Maybe the pipe is not DWV?
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Old 12-21-2012, 07:33 PM   #9
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Maybe the pipe is not DWV?
it really should not matter if it plastic and measured 3 7/8 id a 3"hub flange measures 3 7/8 od....good point though...ben sr
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Old 12-21-2012, 07:43 PM   #10
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it really should not matter if it plastic and measured 3 7/8 id a 3"hub flange measures 3 7/8 od....good point though...ben sr
I thought you guys were nuts - I could have sworn I read 3 7/8 O.D. somewhere
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Old 12-21-2012, 08:00 PM   #11
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I thought you guys were nuts - I could have sworn I read 3 7/8 O.D. somewhere
no your not nuts ..well i really can't say for sure don't know you that well...but 4"plastic abs measures 3 7/8 id and a 3"hub closet flange will glue right into it..we do it all the time... of course this is pvc same
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Old 12-21-2012, 08:05 PM   #12
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no your not nuts ..well i really can't say for sure don't know you that well...but 4"plastic abs measures 3 7/8 id and a 3"hub closet flange will glue right into it..we do it all the time... of course this is pvc same
I didn't say I was nuts- I was questioning you're sanity because I read too much into the thread
Do you use 4x3 90's or pipe the whole line in 4"
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Old 12-21-2012, 08:11 PM   #13
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I didn't say I was nuts- I was questioning you're sanity because I read too much into the thread
Do you use 4x3 90's or pipe the whole line in 4"
4" whole line because after tile we cut off 4" flush to tile glue and hammer drill 3"hub flange into 4"

Last edited by ben's plumbing; 12-21-2012 at 08:13 PM.
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Old 12-22-2012, 10:17 AM   #14
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It is a 4" abs riser in concrete. Is there a flange gasket that goes inside or do I have to bust concrete to get on outside gasket?
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Old 12-22-2012, 10:28 AM   #15
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It is a 4" abs riser in concrete. Is there a flange gasket that goes inside or do I have to bust concrete to get on outside gasket?
Your answer has been posted already- please reread

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