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.