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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?
 

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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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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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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 :eek:
 

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I thought you guys were nuts - I could have sworn I read 3 7/8 O.D. somewhere :eek:
no your not nuts ..well i really can't say for sure don't know you that well:laughing::laughing::laughing:...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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no your not nuts ..well i really can't say for sure don't know you that well:laughing::laughing::laughing:...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 :laughing::wink:
Do you use 4x3 90's or pipe the whole line in 4"
 

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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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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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I personally do not get throttling a 4 inch (It looks like PVC to me, Not ABS. ABS is usually black) pipe down to a 3 inch toilet flange. The mason should have wrapped the pipe with foam, or cut out a hole in a piece of Bead board and put it over the pipe to give the plumber clearance to properly set the flange, if you ask me. Non shrink grout could be placed afterward. I think thats what Ben means, why lose the benefit of the 4 inch pipes diameter.

Its like putting in a 4 lane highway, and bottle necking it down to 3 lanes. Picture the cars as turds. :laughing::laughing::laughing:
 
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