These replacement sacs are for the METAL Parker Converters not Aerometric filling pens.
This is a 15 x 2 1/4 inch Necked and Tapered Sac.
Care should be taken when removing the Black stopper as they will have gone hard and are prone to chipping.
Make sure you refit the stopper in the same position as it was originally.
Sacs should be fixed to the sac peg with SHELLAC
and dusted with FRENCH CHALK
before reassembling the converter.