Summary Information (click on this NSN number for detailed information: 4730-00-003-9559)
Adapter, also referenced with federal logistics item name code 3776:
An adapter having standard pipe threads on one end or an unthreaded end designed to accommodate a pipe. the other end has machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. it is designed to join a pipe or pipe fitting to a tube or tube fitting in a straight line.