self-sealing
adjective
Definitions
Describing a device with seals that activate without special procedures.
Example: The engine had self-sealing gaskets to keep the grease in, just tighten the bolts.
Describing a container that is capable of automatically closing off leaks that form in it.
Example: Many pilots' lives were saved during World War II by salf-sealing gas tanks that kept their planes from becoming fireballs when riddled with bullets.