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Old 02-08-2015, 11:40 AM   #16
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So I got the Fernco donut hub in the pic above. After I dig everything out, how do I install? Do I pound the donut in as far as it will go first, or do I insert the PVC pipe before pounding in to the cast iron wye? It seems like the hole is already tight to insert the PVC and if I pound it in and compress the donut, it will be even tighter.

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Old 02-08-2015, 06:39 PM   #17
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You insert the pipe in the donut first then lube the outside of the donut with a soapy solution and push or pound into the cast iron.
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Old 02-08-2015, 07:58 PM   #18
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I assume you're hesitant to replace the whole stack because you have to open up another wall or two. If the house is sheetrock, remodeling two bathrooms is such an expensive job to begin with that opening up a wall or two to replace the existing stack with plastic definitely makes sense, unless you have a wife who won't let you or you have concrete plans to move soon. Now if you're talking three or four walls, or plaster, or also having to replace tile, or go through kitchen cabinets, it may be a different story... You can probably use the opening to run new supply and electric to the bathrooms while you're at it.
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Old 02-09-2015, 08:09 AM   #19
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Thanks for the input. I will insert the pipe into the donut and then pound in.

I did the stack cutting/riser support on my previous house. That is a last resort. I do not like all that weight of the cast iron stack above the cut being supported by a few riser clamps. I have enough of the walls open that I could do it now, but I also have a cast iron wye right where I need a drain. It is much easier in my opinion to pull out the galvanized pipe and lead and insert a donut than to cut the cast iron and support with riser clamps.

Thanks all for your help.

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