On Jul 21, 10:16*am, Limp Arbor wrote:
I need to add a trap to my cast iron drain in my basement.

I'm going to remove my 4" cleanout and run the trap into that fitting.

Here's the difficulty:
My cleanout plug is threaded into a bushing held into the bell end of
a cast fitting. *The threaded cleanout is a little shy of 4" (about 3
15/16) *I bought a 4" threaded male PVC fitting but it is about 4 1/4.

Do they make a threaded PVC fitting that will go into a 4" female
steel?

Should I just remove the bushing and get the rubber boot that will let
me go from the bell end of the cast down to 4" PVC?

You will need to rework your system from the first available cast iron
bell end in good shape. I have had success in dealing with older bell
ends by using a 9" body grinder fitted with an abrasive cut off disc.
Cut a groove all the way around the pipe, then use the disc to cut
through about half way. Then tapping a cold chisel wedge into the cut
will neatly sever the pipe. If the cut is fairly close to the bell it
is easier to get a drill into the lead and oakum seal and get rid of
it. The bell can then be cleaned with the usual wire brush on a drill
or whatever. At this point measure the bell. Older 4" cast iron was
around 4 1/2" inner diameter IIRC, and the newer is 4 1/4". If you
just buy the appropriate Fernco fitting at your box store it may work
fine with your PVC. If it is a real sloppy fit you will have to call
Fernco customer service and they will likely find a dealer somewhere
who has the older large fitting. From there it will be standard PVC
work, fit up and glue. Good luck.

Joe