Flexible Couplings

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  #1  
Old 01-04-05, 05:29 AM
jawcpa
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Flexible Couplings

I have a three inch PVC drain coupling that has started leaking after eight years. It services one toilet and the washing machine. It is running thru floor joists but is easy to get to. Rather that trying to use a sealant I prefer to cut out the PVC coupling and use two 3 x 3 flexible couplings.

Note - Since one flex coupling will not span the gap left by the removed PVC coupling, I want to take out the PVC coupling, make a separate cut in the line, and join the sections with the flex couplings. If I do so, do I need to take up the entire gap and butt a new PVC pipe to the existing lines or will the flex couplings allow me to have a gap of about 1.5 inches between the ends of the pipe?

Thank you.
 
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  #2  
Old 01-04-05, 05:34 AM
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It's best to get pipes as close as possible, 1.5 should be ok just split the difference.
 
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Old 01-04-05, 04:49 PM
jawcpa
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Flexible Couplings

Plumber 2000,

Thanks for the fast reply. The PVC coupling that I am cutting out is approx. 3.25" - so I am splitting the difference to just about 1.6" for each flex coupling. The PVC drain pipes will extend into the couplings - beyond the stainless steel screw clamps, so hopefully it will make a tight (leakproof) seal.

From everything I read on the manufacturers' websites, these flexible couplings (neoprene) generally meet building codes for drain lines.

Again,

Thanks.
 
  #4  
Old 01-05-05, 05:59 AM
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Actually, a rubber Fernco coupling sleeve with two large hose clamps will meet code for drain line connections, but since you have small gaps, the stainless steel sleeve coupling (aka "no-hub" or Mission coupling) should work better in this case.
Good Luck!
Mike
 
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Old 01-09-05, 07:41 AM
jawcpa
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Mike:

Thanks for the tip.
 
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Old 01-09-05, 07:48 AM
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No hub couplings require a special fitting called a no hub adapter fitting, (see picture below), when you use no hub coupling with abs/pvc dwv, just use the frenco's split the difference and it should be fine.



Image by dafehr.com
 
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