Abstract: A closure to be applied to a container for holding a liquid such as shampoo. The closure comprises a closure body, a discharge liquid tube extending through the closure body and a reciprocating air pump mechanism built in the closure body. The air pump mechanism includes a cylinder whose discharge side communicates with the inside of the container and whose intake side communicates externally of the container, a piston, and a spring for elastically biasing the piston toward the intake side. The piston has a rod whose free end portion extends outwardly of the closure body.

Abstract: A closure for containers comprises an automatic opening-closing mechanism and an outside closure member having a pour opening. The automatic opening-closing mechanism includes a plug member having a centrally formed air introduction hole and a plurality of liquid discharge ports formed around the air introduction hole, a first valve member for opening and closing the liquid discharge ports and a second valve member for opening and closing the air introduction hole.