Pelican 1510M Case and Mobility Kit without Foam, Black Pelican 1510MNF Case and Mobility Kit - 1513 O-Ring - Pelican Warranty The automatic pressure equalization valve allows air to flow in and out of the case while still maintaining a waterproof seal The top and side handles are over-molded with rubber for added comfort when carrying the case Stabilizing blocks are built-in so you can lay the case down flat when accessing your equipment Withstands temperatures from -40 to 210deg.F