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Old 06-25-2013, 02:11 PM   #1
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Hi guys,

I have to connect some pvc pipe under my kitchen sink to a cast iron drain. The cast iron opening is 1 1/2 and I went to home depot asking the clerk there to help me out.
He gave me some pipe, a male adapter to connect the pipe to my old pipe under the sink, and a rubber gasket to go over the cast iron where the new pvc is gonna connect.

My question is: coming home I notice that the new pipe going to the cast iron doesn't actually go "into" the cast iron hole but sits right next to it if I would use the gasket.That can't be correct, right? He said the gasket would go over the cast iron opening and hold the pipe to it (I guess). Shouldn't I use something that can help direct the pipe into the hole (like a adapter or such)? I just want to be sure.

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Old 06-25-2013, 02:36 PM   #2
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Gotta picture of what he gave you? And for that matter, a picture of your 2 pipes coming together...

What it sounds like you need is THIS(<---link). (or something similar, sized appropriately)

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Last edited by jproffer; 06-25-2013 at 02:38 PM.
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Old 06-25-2013, 07:06 PM   #3
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#1 Highly unlikely it's cast Iron, most likely it's steel or galvanized pipe.
Steel and galvanized pipe will close up on the inside, rust out and leak 100% of the time.
Really needs to be replace with PVC.
Most often there's an adaptor that screw to the nipple in the wall and adapts it to 1-1/2 PVC. There should be a big not and a tapered gasket inside the nut.
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Old 06-25-2013, 07:30 PM   #4
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No, the drain behind the wall is cast iron drain. It did have a nipple that I removed tho, it was rusted.

Here's a pic. The top pieces are new (the rubber gasket, the long pipe, and the male adapter below them). The rubber gasket I was told supposed to go around the cast iron opening, but the new pipe (that's attached to it in this pic) will only meet the hole of the drain, not enter it. So it'll basically sit right next to the drain line inside the gasket if I put it up like this).

Below the new pipe is the little male adapter that screws into my old pipes (also pictured next to it). I didn't have any problems with that.
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Old 06-25-2013, 07:51 PM   #5
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If I understand this correctly, the male adapter screwed into your old cast iron pipe. If correct, you don't need the rubber coupling. The PVC pipe can be glued to the adapter and then you can finish your drain.
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Old 06-25-2013, 07:55 PM   #6
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Quote:
Originally Posted by djlandkpl View Post
If I understand this correctly, the male adapter screwed into your old cast iron pipe. If correct, you don't need the rubber coupling. The PVC pipe can be glued to the adapter and then you can finish your drain.
Sounds right-

That so called rubber fitting needs to go back to the store. While you're there, explain to the sales person that you were sold a coupling that is not designed for your situation.

Male adpt. into the tee(using thread sealant)
Then pipe to the trap. Glue on a 1.5" trap adpt to receive your trap
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Old 06-25-2013, 08:45 PM   #7
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Yep, that Fernco only works if you have something for it to grab onto. Are you able to get to that Drain Waste from the Vent to where it goes under the floor, and just put in all pvc, vs. trying to keep the old?

You can keep the Waste vent as is, unless it is rusted from the first foot from backups over the year, then you would need to cut in some PVC for that section also.
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Old 06-25-2013, 09:10 PM   #8
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Please attach a picture.


It can be difficult to give advice when you don't know what materials you have and you don't know how to describe it.
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Old 06-26-2013, 01:58 PM   #9
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Thanks for the reply guys. Really appreciate it.
Just for reference, my cast iron drain looks sorta like this:
And, yes, the guy at Home Depot said that the rubber gasket would go over that opening (on the left) and hold the pipe.
I went to my library for a plumbing book, and I found a picture of another gasket called a neoprene gasket that actually slides into the cast iron hub and it shows a pvc going into that. That seems easier (to me) than to use a male adapter, but is there any benefit in using either methods?

Otherwise, I understand using another male adapter like the one I have into the cast iron hub would also be ok?
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Old 06-26-2013, 03:05 PM   #10
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The idiot at Home Depot does not know wth they are talking about. The only way the Fernco would attach there, is if there was enough pipe sticking out of that female fitting, to allow you to clamp it.

When Cast Iron piping was put together back in the day, they used Oakum packed in, then used heated up Lead that was poured out of a ladle into the flange to hold everything together.

Now if you have to remove the old pipe out of the cast iron, you have to use a different method of attaching PVC to fit inside the flange of the Cast.

Pexsupply.com has the DWV adapters, that you need. http://www.pexsupply.com/PVC-DWV-Ada...tings-14930000 You may find one at Home Depot, but doubtful. Better to go to a local plumbing supply house, or order from pexsupply.com and have it in a couple of days. Also see http://www.yourepair.com/1504/howto-...aste-pipe.html which you will need one of the doughnuts shown in the picture, once you get the old metal pipe out of the Cast-iron. That will mean using a drill to get enough of the lead out around the pipe, so you can then pry it out along with the Oakum, to clean it out to put in the doughnut and then the PVC piping.
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Old 06-26-2013, 03:06 PM   #11
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Also, this was discussed on here back in 2010 rubber gasket donut for cast iron sewer pipe to pvc This is a list of the doughnuts that Fernco makes http://www.fernco.com/plumbing/donuts-o-rings/donuts

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Last edited by gregzoll; 06-26-2013 at 03:09 PM.
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