A plastic closure for dispensing thixotropic fluids from a flexible bottle. The closure has a bottom part including a cover surface with a spout opening Beneath the cover surface a support surface in which several axially extending through-passages are disposed, which are radially offset relative to the spout opening. The support surface includes partial elements in the form of tongues, which are integrally formed on an annular jacket wall by way of integral hinges which engage in a pin in the installed state. This results in a closure that can be manufactured particularly inexpensively, is simple to install, and can be produced in one piece.