The end item is forrestal class cv
An item designed to be attached to the liquid chamber of an indicator, sight, liquid permitting the visual examination of the amount of liquid in a reservoir, pipe or the like.
Classification: Instruments and apparatus for measuring or checking the flow or level of liquids, nesoi
NSN 5960-01-093-2740
NSN 5998-01-376-7878
NSN 5965-01-079-7939
NSN 4140-00-881-1052
NSN 6220-01-648-1569
NSN 5920-01-398-1626
NSN 5999-01-484-4160
NSN 5835-01-464-7038
NSN 6110-00-881-1050
NSN 6220-01-112-8855
NSN 6130-00-291-4877
NSN 5915-01-107-3167