Pipedown wrote:

If it really can be reapired you would need some welding equipment minimum
and a sand blaster would be nice to clean it up. You should check the
yellow pages for a blacksmith ing, they are getting rare but would be
exactly what you need. If you aren't already experienced in welding, then
it probably isn't a job for you. While you're at ti, check the Y pages for
Welder as well.

I guess the alternative would be to dig up and replace the old trap with a
new one at great effort.

Brazing would probably be a better option, both to reattach the broken
cast piece, as well as to fill the stripped holes for redrilling and
retapping. Potentially DIYable with one of the little Oxy-Mapp setups,
though Oxy-Acetylene would be better.

As another option, a filled epoxy like JB-Weld would probably be
adequate for filling the stripped holes since there isn't much load on
those bolts. JB-Weld is DIY, and you could take the cover to a local
welding shop for them to reattach the broken piece. Would save an
on-site welding / brazing trip and associated cost if you're not up to
doing the work yourself.