I have a cast iron sewer pipe riser that is 4". the top of it is a hub,
inside the hub is a rubberised gasket (I think some calls it a donut).
Inserted into this donut is a metal cylinder adapter with threads on the
inside where the brass cleanout plug screws on to. The plug and the threads
are all corroded and gone, I cut the plug out and now I am trying to pull
off this metal cylinder and the donut but the donut won't come out. I
cursed and cursed and pryed and pulled and it just won't let go.
If your just replacing the clean out cap I would cut the 4" line below the
hub bell. Cast iron does not cut easy with about any kind of saw blades.
I use a chain cutter also called a snap cutter to do it very easy. Last
resort is a grinder with a cut off wheel but wear a mask and eye
protection. Snap cutter is best call around and barrow or rent one.
Recconect pipe fittings with a no hub coupler (any home store) and ABS
Easy as can be with a slide hammer and a 3 prong hook adapter. Borrow
what you need from your favorite auto shop or look over the adapters
at a tool rental place that has the slide hammer. Mechanics have used
slide hammers for years to pull axles and brake drums. To see what the
tool looks like, check out the Matco or SnapOn web sites. OTC is
another company that makes them.
If this seems like too much trouble, simply drill a series of
overlapping holes in the Fernco rubber and slice the metal cylinder
with your SawzAll and in due time it will give up. The rubber needs a
very sharp drill to be effective.
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