i think i ve seen similar plugs in the cargo area under the carpet
This is what it is. I don't have a floor plug that looks quite like whats pictured. Close, but a little different.Looks like plug in back door but sure you would notice it gone
As someone said above, it was likely dropped by someone installing it at the factory, I have torn everything out of the back of my JKU and there are no other spots for that plug to go to. Stick it in a jar marked Jeep parts, someday you may need it.They are the same size as the two in the tail gate. But they're both there. So the hunt begins...
It's funny you should mention that. We looked in the small jack compartment for the first time last Saturday, low and behold it was under water and had been that way for some time. Got caught in a major downpour with back windows and rear window removed on our Trek NX. At the time we looked in the tool box area and had no water whatsoever, but surprise it all went in there apparently. Pulled the plug (which looks bigger than the OPs plug) but similar design. Thankfully it had not gotten musty and all slimmed up yet.Check under the jack. If that is where it is from, and you occasionally get into water or get rained on with the top off, leave it out! That compartment will hold water and will rust the jack, handle, etc.