Cap for marking instruments

摘要

A cap for use with marking instruments having a barrel which carries at one end a marking nib. The cap comprises a generally cylindrical shell which is open at both ends. A conical shaped nib sealing element is disposed within the interior of the shell and spaced from each end thereof. The nib sealing element is adapted to fit over and seal the marking nib and is spaced from the cap shell to permit air to pass therebetween.