Converting a 1/2 bath to a laundry room, so naturally the toilet came out. Once I remove the toilet flange, is a test plug sufficient to seal things off? Or do I need to go back further?

i would stuff newspaper down the drain leaving 3-4 inches ontop and pour a soupy mix of cement into the drain.
make sure to use newspaper not a rag. if it falls into the pipe the paper will disolve doing no harm.

Test plug would be great especially if down the road you decide to change it back to a toilet

If the floor is sloping towards it you could open the subfloor a little and modify it into a floor drain.



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Thanks kindly!



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sum,

no, you can NOT unless you were to add a 3 or 4" TRAP

OP,

if you REALLY wanted a 'euro' look you could convert the entire room into a 'shower pan' with a sink PROVIDING you have access from below to convert drain by adding a trap



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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Bernabeu I know a trap is needed for a floor drain that's why I said modify the subfloor.

I have seen those floor drain and CO Combo fixtures that behave like a floor drain with a trap, but has a built in direct path to use as a CO when necessary.



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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638