What is the easiest way to disconnect toilet flange and the rest of my lavette's plumbing?

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JamieRI

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Location
Wakefield, RI
I turned this lavette in my 1960 RI Ranch house into a pantry sometime in the 1990's, leaving the rough plumbing intact for another day.
Today I ripped out the old flooring and plywood, exposing the original floor.
I want to remove the toilet flange, and all the sink plumbing and put in a new floor, probably peel and stick vinyl tiles. I might put a layer of plywood down to cover the original flooring and the plumbing holes.
20241027_200059.jpg

In the basement, the toilet and sink drain joins and runs to the left past a vent stack into the laundry room for laundry and kitchen drains. I need to keep the vent, and I would like to cut and remove all the plumbing in the lavette. 20241027_200734.jpg

Do I cut the 3 inch copper drain perhaps 3 inches to the right of the vent tee, and cap it?

What would be an approved cap or plug for this copper drain?

Is this Fernco approved for this use? https://www.fernco.com/dimensional-drawings/qc-103
Or a plug like this? https://www.amazon.com/Steel-Mechanical-Sturdy-Cleanout-Galvanized/dp/B0C4PQZ6GR?th=1

What is better for cutting 3" copper pipe? A Sawzall with a fine tooth metal blade, or a grinder with metal cutoff wheel? Oscillating multi-tool? I have all of these and none sound perfect...

I also have to cut the pipe leading to the toilet flange so I can remove it...20241027_201152.jpg


Here are the rest of my photos to show the whole scene. The copper drain changes direction 90 degrees twice without any cleanouts, was that OK? (it is about to become just a vent, a big fat one.
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I had to move the laundry drain this high when my sewar lateral moved up do deal with

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All advice is appreciated!

Jamie
 

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I just opened up the Fernco between the copper and PVC, and it is 1/3 filled with probably garbage disposal mash. The long horizontal run was clogged a few months ago and this pipe backed up. I need to clean that all out... how? I'm not sticking my hands in there!
 

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Use shielded pvc to DWV copper ferncos at the transitions. I would also put a cleanout or at least a long sweep at the 90's. You could also put a cleanout at the end after you cut out the pipe for the old toilet. If it were me i would remove as much of the DWV copper and replace with PVC as i was doing the work
 
Use shielded pvc to DWV copper ferncos at the transitions. I would also put a cleanout or at least a long sweep at the 90's. You could also put a cleanout at the end after you cut out the pipe for the old toilet. If it were me i would remove as much of the DWV copper and replace with PVC as i was doing the work
Thank you
I like the idea... Would you also remove the copper DWV tee at the copper vent stack, and connect to it via a shielded PVC to DWV copper below the floor above? Then all is PVC except for the existing vent.
 
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