closure
devices and techniques used to close or seal a bottle, jug, jar, tube, can, etc.
mitre gate
Pair of canal lock gates
bottle cap
top for holding liquid inside a bottle
obstruction
blockage of the normal flow of the contents of an anatomical passageway
expansion slot bracket
bracket that mechanically secures an expansion card to a computer case
lid
part of a container that closes or seals it by fitting over and around the opening
bow visor
bow arrangement
bung
conical closure that fits into a container's opening to seal it