This document specifies the dimensions, tolerances and required characteristics of protective plugs, non-metallic, for NAS1760 fitting ends and AS33649 boss ports 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.