I thought I took a picture to share, but apparently I didn’t…
I have seen this a couple of time; behind the refrigerator about 3’ off the floor, what appears to be a clean-out. Measurement approximately 1-1/2" diameter, plugged with a threaded plug. There wasn’t any plumbing directly above the refrigerator area that would justify a clean-out, but that’s what it looked like. It’s like the clean out that you’d see behind a washing machine.
Is that what it is? A clean-out?
Thanks in advance.