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Old 09-23-2016, 10:07 PM   #1
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Service Cast Iron Adapter Confusion


I'm adding a drain connection to a 110 year old stack which I've determined is a 4 inch "service" cast iron pipe (outer diameter 4.3"). I need to couple a 4" Schedule 40 PVC pipe to it, but that has a 4.5" outer diameter.

Obviously the standard 4 x 4 Fernco flex couple won't do the job, and I've been scratching my head on how to do this. I came across this other Fernco product for service weight C.I. pipes (Multi-Tite):


https://www.fernco.com/plumbing/donu...e-pipe-gaskets

I'm confused about how this works. I would assume I need the 4 x 4 variant (SVG-4) and I'm guessing I need to shove the donut into the cast iron. But on inspection of a unit at Home Depot, I found that a 4" PVC pipe fit inside the top opening, but the other end looked like it would be way too big to fit into the cast iron. If I use brute force, won't that distort the ring and lead to blockages?

And assuming I figure out how to use this thing, do I then need a standard 4x4 Fernco on top of everything?

Thanks in advance for any guidance on this
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Old 09-23-2016, 10:50 PM   #2
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Re: Service Cast Iron Adapter Confusion


The gasket doughnut you show goes in the hub of cast iron. A transition coupling is needed to join plain end pipes together. Are working with a hub on the cast iron?
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Old 09-23-2016, 11:40 PM   #3
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Re: Service Cast Iron Adapter Confusion


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Originally Posted by TheEplumber View Post
The gasket doughnut you show goes in the hub of cast iron. A transition coupling is needed to join plain end pipes together. Are working with a hub on the cast iron?
Gotcha, so that's supposed to go into the hub. Working with the hub will not be possible for me, I'll be sawing the pipe and working on the cast iron.
What are my options?
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Old 09-24-2016, 06:39 AM   #4
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Re: Service Cast Iron Adapter Confusion


No hub couplers, commonly called Ferncos after the brand name.
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Old 09-24-2016, 08:27 AM   #5
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Re: Service Cast Iron Adapter Confusion


https://www.fernco.com/plumbing/shie...flex-couplings
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Old 09-24-2016, 10:12 AM   #6
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Re: Service Cast Iron Adapter Confusion


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Originally Posted by TheEplumber View Post
Thanks for the tip, so are these shielded couplings standard for transitions between differing diameters? Just want to make sure that the .2" reduction going down isn't going to result in an unfortunate "incident"
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Old 09-24-2016, 05:01 PM   #7
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Re: Service Cast Iron Adapter Confusion


Proflex brand transitional coupling is the name fernco uses. Buy CI to PL on the label.
Another is mission brand .
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Old 09-26-2016, 02:33 PM   #8
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Re: Service Cast Iron Adapter Confusion


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Originally Posted by Ghostmaker View Post
Proflex brand transitional coupling is the name fernco uses. Buy CI to PL on the label.
Another is mission brand .
as long as it's a tight seal with the bigger diameter pipe sitting on top of the smaller diameter pipe (4.5" OD --> 4.3" OD)
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Old 09-26-2016, 04:11 PM   #9
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Re: Service Cast Iron Adapter Confusion


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Originally Posted by delawhere View Post
as long as it's a tight seal with the bigger diameter pipe sitting on top of the smaller diameter pipe (4.5" OD --> 4.3" OD)
The ID is 4" on both
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Old 09-26-2016, 07:58 PM   #10
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Re: Service Cast Iron Adapter Confusion


looking at this site you need part number 3000-44. that will connect service CI to plastic for 4". https://www.fernco.com/plumbing/shie...flex-couplings
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Old 09-26-2016, 11:16 PM   #11
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Re: Service Cast Iron Adapter Confusion


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Originally Posted by paul100 View Post
looking at this site you need part number 3000-44. that will connect service CI to plastic for 4". https://www.fernco.com/plumbing/shie...flex-couplings
Thanks Paul, wasn't sure about the diameters. I'll go ahead and order a couple of 3000-44 units
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