Plumbing drain access?

An agent sent me this photo asking what it is from an inspection I did for him a while back.
I’m not sure but I think it’s a plumbing drain access. Is that right?
Thanks for your help.

Looks like a clean out.

Basement/slab floor? house trap cleanout most likely. Need to open to verify.

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cleanout plug?



Yes, in the basement.
Thanks everyone. Much appreciated.

@mcyr House trap! That explains the adjacent caps. I do not see those here. Thanks for the diagram.

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