Piston converter for most Parker fountain pens. Standard ink cartridge colors are no longer a limitation, just twist the black knob to pull ink from a bottle in to this converter. Parker converters will also fit most modern Aurora fountain pens.
One of the nicest "universal" or "standard" converters on the market. If you
look closely, there are some details that do make it work better. The rubber on
the section end is softer and has a double seal compared to all the others I
have. Does that make it better? I don't know. My others don't seem to leak,
cause skipping or any other issues either.
The converter works flawlessly and holds a bit more ink than the original
cartridge. I does however creat a vacuum so it occaisionally needs to be
advanced to allow flow to the nib. This suits me fine as I am now always aware
of my portable ink supply and able to use all my inks.