This isn't going to be something easy to fix for most
do-it-yourselfers. The arrow in the picture above is pointing to a crack
that runs all the way around the cast iron waste pipe fitting.
If something like this is left unrepaired for a long enough time, you
could find your self dealing with foundation problems. As the water
leaks out of the waste pipe regularly, it could start to wash away the
soil that's underneath the structural building foundation.
Home Repair Tip: Cut above the cast-iron fitting and below the cast-iron
fitting at least 4 inches. This damaged exterior drain pipe fitting
hooks up to the bathroom sink drain. Disassemble the drain from the
inside and you should be able to remove the damaged fitting safely.
You can use cast-iron or plastic, the choice will be up to you. If
you're comfortable working with one material more than the other, then
by all means use that material.
You will need to purchase a new plumbing fitting and this type of
plumbing waste pipe is called a san tee. Make sure that you install the
san tee correctly. You do not want to install it upside down.
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