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mjnovak77 08-14-2006 02:08 PM

How to? Cast Iron Stacks.
Hey guys. I'm moving my bathroom around and I need to re-locate some of the drains. Also I've got a hole in the lead elbow for the toilet. So I need to know how to get those cast iron fittings apart and how to convert to PVC. Any help is appreciated.


redline 08-14-2006 02:51 PM

Will you be removing all the cast iron?
Best way to cut cast iron is with a chain pipe cutter. See if you can rent one.
Or a hand grinder.
Or a recip saw.

Bonus 08-14-2006 04:02 PM

As Redline says, chain cutter if you have room, recip saw cuts it quick too, just don't run the saw at full speed, this heats up the blade and wears it out. Cut it somehere that you have two or three inches of pipe left over w/o a flange and then put on a Fernco fitting. (Rubber sleeve that will join the iron to the plastic.

jamesdart 09-11-2006 06:45 PM

what about the rubber donuts that fit in the female coupler end of the iron pipe and stick pvc in it? how do these work? i tried the sawzall diamond blade and it seemd to take forever. i need to move my waste line into a wall and want to just go to pvc for what im replacing.

Ron The Plumber 09-11-2006 07:15 PM

Why not cut a section of the cast out, and transition it to pvc from there? Snap Cutter do a fine job on cutting this pipe. Just make sure you support the pipe prior to cutting.

fqp25 09-11-2006 07:16 PM

Using a donut inside of the hub, can result in problems down the line. The donut can come loose, I've always said that those are for underground work.

To get the pipe or fitting out of a hub, you usually have to burn the lead out.

Using a Sawzall you need to use a tungsten blade. A grinder with a cutting wheel might work if you have the space.

If you use a coupling, I would recommend a "no-hub" coupling instead of a fernco. A no-hub has a wide stainless steel band which grips the pipes better. You might have to go to a plumbing supply house for this.

jamesdart 09-13-2006 02:32 PM

i want to use the donut because i have to basically replace it from the hub in my basement, all the way up to the second floor. i dont own a snap cutter and the pipe is right up against my basement wall, there isnt enough room to get anything around it. i also have 4" in my basement with only one bath feeding into it, my bath is 3" off the toilet untill the hub where i used a 3" to 4" rubber coupler when i did the bath. now i need to remove the iron pipe because it sticks out into my living room and i want to run 3" pvc inside the wall. 4" will not fit. any other ideas?

Ron The Plumber 09-13-2006 05:55 PM

You have to pound in the donut around the PVC pipe, not an easy task, these fit real tight, apply silicone to the donut to help in the installation, this will make is slick, once you start don't stop pounding it in, once in silicone will help in sealing it.

jamesdart 09-14-2006 08:26 PM

silicone adhesive? or the spray lube? im assuming adhesive. thnaks for the tip.

Ron The Plumber 09-14-2006 08:46 PM

An adhesive.

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