This document specifies the dimensions@ tolerances and required characteristics of protective caps@ non-metallic@ for EN 6123 fitting ends to seal fluid ports during transportation and storage in order to prevent: ?? contamination by moisture@ fluids@ chemicals and particles; ?? spillage inside package or aircraft section; ?? port and pipe end damages; ?? port and pipe clogging due to plug ingestion. Because of the cleanliness requirements@ parts shall only be used once.