I found this HACK joint on a bathroom I ripped out from the late 60's-early 70s. It is a 1 1/4" copper DWV transition to 1 1/2" ABS. They shoved the copper into an ABS coupler and used putty to seal it (the yellow stuff in the photo) then wrapped it up with electricians tape. This was used as a vent (so no water leak, but probably leaked sewer gas). The price on the 12 foot length of 1 1/4" copper is written $9.39!!!! (I washed this piece so you could see it better in the photos).
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