This Pilot CON-B Squeeze Converter fits all current Pilot and Namiki cartridge/converter fountain pens. This is the same converter that comes standard with the Pilot Metropolitan. To fill the Pilot CON-B Squeeze Converter submerge the pen nib in the bottle of ink. Next you will squeeze the converter to expel any air inside. Slowly release the converter while the nib is submerged to fill it up.