iSeries 4213-12 CaseProduct Overview SKB iSeries Injection Molded Mil Standard Waterproof Cases are molded of ultra high strength polypropylene copolymer resin, featuring a gasket sealed, water and dust tight, submersible design (MIL STD 810H) that is resistant to corrosion and impact damage. Standard features include a molded in hinge, padlock loops, Trigger Latch System, snap down rubber over molded cushion grip handle, automatic ambient pressure equalization valve