Can I use a rubber Flexible PVC Coupling on sewage discharge line?


  #1  
Old 05-03-18, 05:47 AM
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Can I use a rubber Flexible PVC Coupling on sewage discharge line?

Hello all,

I need to install Zoeller M267 (2" discharge line) Waste-Mate Sewage Pump, 1/2 Horsepower on my Sewage Basin.

The old one was Zoeller M98 (1 1/2" discharge line) and I assume the builder installed a 2 in. x 1-1/2 in. PVC DWV Reducing Coupling. Since, only pure water flows into the basin, so far so good.

My question is whether I can use a 2 in. x 2 in. DWV Flexible PVC Coupling to connect the sump pump to the existing 2" pipe because it will make the future maintenance easier.

My only concern is whether the rubber coupling can resist the constant water pressure inside the discharge line.

Again, I am not able to reuse the current pipe under the pit cap because the old one was M98(1 1/2" discharge line), the new one has to use 2" discharge line.

The pipe outside the pipe is 2" though.
Thank you

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Fernco 2 in. x 2 in. DWV Flexible PVC Coupling
Model #P1056-22
 

Last edited by PJmax; 01-28-19 at 07:39 PM. Reason: cropped/resized picture
  #2  
Old 05-03-18, 07:49 AM
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I hate those things. I don't know what kind of pressure you have with your sewage pump but I know those couplings do not care much for water pressure. Best used in exit piping if you want my opinion, and using anything else is probably better then them.

I had one on a PVC pipe bringing water from the lake to my cottage. It is under pressure of between 20psi and 40psi. It worked for about a month. It actually starting bulging in the middle of the coupling (thanks to its flexibility) and then blew at around 5:00am in the morning. Luckily it was in my dirt floor crawlspace but it was a little early for me to rise that day and then spend the next hour in my damp cold crawlspace.

They get a thumbs down from me, especially if you plan to use a 2" coupling on a 1.5" pipe. I am not sure if that was your plan but that would not last if you ask me.
 
  #3  
Old 05-03-18, 07:58 AM
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@OptsyEagle,


"They get a thumbs down from me, especially if you plan to use a 2" coupling on a 1.5" pipe. I am not sure if that was your plan but that would not last if you ask me."

I am using the flexibility 2" to 2" rubber coupling to connect the sump pump to existing 2" discharge line to exterior of the house.

I agree 100% with you but I did see some professional people use it.

Thank you
 
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Old 05-03-18, 08:16 AM
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Yes, you can use a somewhat similar coupling. It's called a shielded coupling and it's like the rubber sleeve but it also has a stainless steel sleeve that goes over the coupling to prevent it from budging.

 
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Old 05-03-18, 10:20 AM
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@Pilot,

I found Proflex 2 in. Neoprene Shielded Coupling through HD website.

https://www.homedepot.com/p/Proflex-...0-22/100372285

Interesting, this product is rated as maximum 4.3PSI same as last one I posted.
Thank you

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Old 05-03-18, 12:22 PM
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Have you tried one these barb couplings. They come in nylon and brass and a few other materials. It works great for coupling PVC pipe. It is what I used to repair my water line in my crawlspace and it has been working, leak free and blowout free for over 5 years now. I suspect it will last long after I am gone.

It just needs a hose clamp on both ends. If the sewage line is underground I would probably put two, stainless steel, hose clamps on each end, with the tightening screws opposite each other.

They work great for water. I cannot say how it would work for sewage but I would think they would be fine and they will not leak or blow. They have a 150psi rating.

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Old 05-03-18, 12:32 PM
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That barbed coupling isn't designed to work for rigid PVC. That's for poly lines like pools and spas. How would a clamp work on rigid plastic pipe with .15" thick walls? What do you do...hammer it in with a mallet? And it sure as heck isn't to code.
 
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Old 05-03-18, 01:01 PM
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Sorry. I always mix up the terms polypipe and PVC. Not a plumber here. I suppose my water line is polypipe because they work great on that stuff. Definitely would not work on rigid plastic.
 
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Old 05-04-18, 01:22 PM
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Hello all,

I got a confirmation from the Zoeller Pump Company and the Fernco 2 in. x 2 in. DWV Flexible PVC Coupling will work perfectly fine with this application.

Thank you all.
 
 

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