rubber coupling question

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Old 01-13-14, 12:27 PM
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rubber coupling question

I used a rubber nut coupling (fernco brand) to join two pvc pipes. Very easy to use.

Does the cut of the pipe have to touch each other, be an exact fit or can there be a gap between the two pipes being joined?
 
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Old 01-13-14, 01:44 PM
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A gap is OK. In fact if you look inside the Furnco you will see a ring that will actually seperate the two pieces of pipe from touching.
 
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Old 01-13-14, 02:11 PM
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A gap is OK. In fact if you look inside the Furnco you will see a ring that will actually seperate the two pieces of pipe from touching.
The one I used was like a slip coupling, no ring to stop them.
 
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Old 01-13-14, 04:25 PM
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The one I used was like a slip coupling, no ring to stop them.
By code a shielded coupling must be used... These are called no hub couplings...( Needs a band around it. And the is a stop inside where the two pipes meet...)


 
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Old 01-13-14, 04:39 PM
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By code a shielded coupling must be used... These are called no hub couplings...( Needs a band around it. And the is a stop inside where the two pipes meet...)
This is what I was refering to. But this brings up another question. If it's used only as a drain can a non-shielded be OK?
 
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Old 01-13-14, 04:43 PM
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This is what I was refering to. But this brings up another question. If it's used only as a drain can a non-shielded be OK?
No....................................................
 
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Old 01-13-14, 04:48 PM
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Just curious Mike....what about a vent? Like in an attic or similar. Or PVC used in a drain pipe for gutters? Always ready to learn!
 
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Old 01-13-14, 04:54 PM
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All DWV need to use a shielded coupling... As far as storm drains... IDK...

The only time I believe a not shielded coupling is used is for clay pipe...

There is something in the code though for when used as a repair but I would need to reference it...

Anyway a shielded coupling can be rolled back when you have 0 tolerance to move the pipe... A unshielded one is so thick that it cant be rolled back..

Plus the code dictates the movement of the joint with an unshielded coupling... Shielded is more secure and rigid...
 
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Old 01-13-14, 04:56 PM
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Thanks bud....just wondering.
 
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Old 01-13-14, 05:52 PM
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You could mull through the codes...

http://www.doityourself.com/forum/pl...ing-codes.html
 
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Old 01-14-14, 05:11 AM
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Thanks for bringing that up about the shielded coupling. I will keep that it mind if I need to use one again.

In my case I used the non shielded rubber one a 1.5 PVC used at a sump pump as a quick disconnect for the pump. I assume that is OK?? Is it any less secure than a shielded one in that application? Just like the check valve that is not banded.....
 
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Old 01-14-14, 05:18 AM
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that coupling at sump pump is fine....................
 
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Old 01-15-14, 12:50 AM
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The banded coupling is to hold the pipes in alignment. The only place I know where a non-banded fitting is allowable is when the entire system is buried underground and the pipes cannot move.
 
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