Product Description : Pelican cases are kept watertight through the use of a tongue and groove fit and a polymer o-ring Pelican cases come standard with an Automatic Pressure Equalization Valve which releases built up air pressure while keeping water out Pelicans Pick NPluck foam lets you customize the interior Stainless steel reinforced padlock protectors Single folding front handle with no-slip overmolded cushion grip Pelican cases are kept watertight through the use of a tongue and groove fit and a polymer o-ring