The seal that the front cover closes into. The little gasket that goes all the way around the exterior back cover. When you open your camera up you’ll see the little black rubber gasket around the outer edge. Your depending on the front to close into it with adequate pressure for a “seal”. I have four now and only had one issue that was quickly fixed by bushnell. They are great cameras. I haven’t had squirrels try to chew my antennas yet but theres always tommorow.
