The original Pli-Glass sacs used in the Aerometric was very durable, but will eventually fail.
These replacement sacs have been reproduced to the same specifications as the originals.
Ensuring long life and an excellent filling capacity.
This sac is used to replace the sacs in the STANDARD size Parker '51'
Sacs should be fixed to the section with SHELLAC
and dusted with FRENCH CHALK
before reassembling the pen.