BIG WRENCHES
I had a 2 1/4 IIRC, for a 4" black iron drain clean-out.
Needed to open the clean-out, saw this wrench at a thrift store for $2.
It was actually half a wrench, with about 3 feet of bar stock welded to it for leverage.
Bought it.
It fit.
What are the odds?
...and the extra leverage came in handy.