Looks like it's there but can't quite tell from those pics. They're not real close up and that thing needs a bath. DJ, it shouldn't be that hard to figure out. Either there's a rubber o-ring glued on there or not. The rest of the cooler is entirely metal and will not feel like rubber. The o-ring would be on the side shown in the 1st & 3rd pics posted. It's not real big, about 3mm in diameter and will fit into a groove where the black paint stops. (no paint allowed in the groove so the glue sticks).
