The Kaweco mini converter fits most standard universal fountain pens and is designed specifically for pens with smaller barrels such as the Kaweco Sport fountain pens.
The converter has a plunger fill system that measures 1 3/8" when compressed and 2" in length when fully drawn out.
The exterior diameter of the converter is just under 1/4".
Because the Kaweco mini converter is designed for short length barrels it has only 0.5 ml of ink capacity.