Rotary Converter for PILOT Fountain Pens

PILOT Signature Cartridge (IC-50) & Rotary Ink Converter (CON-40) Only:
Desk Fountain Pen, MR Range, Prera, Cavalier, E95s, Capless

PILOT Signature Cartridge (IC-50), Rotary Ink Converter (CON-40) & Push Button Ink Converter (CON-70):
Kakuno, Explorer, Falcon, Justus 95, CUSTOM 74, CUSTOM 742, CUSTOM 743, CUSTOM 845, CUSTOM Heritage 912, CUSTOM Heritage SE, CUSTOM Urushi, Namiki

Cartridge-Converter: A cartridge-converter fountain pen can use either ink cartridges or an ink converter. The converter is a removable and refillable unit that replaces the cartridge. It allows users to draw ink from a bottle, providing more ink options than cartridges alone.

Vacuum Filler: A vacuum filler fountain pen utilises a vacuum mechanism to draw ink into the pen's reservoir directly from an ink bottle. By compressing and releasing a mechanism on the pen, the vacuum is created, pulling ink into the pen. It offers a larger ink capacity than cartridge-converter pens and is relatively easy to refill.

Piston Filler: A piston filler fountain pen employs a piston mechanism built into the pen's barrel. By twisting the end cap, the piston moves, creating a vacuum that draws ink into the pen from an ink bottle. This mechanism also provides a higher ink capacity compared to cartridge-converter pens and allows for easy refilling without the need for a converter or cartridges.

As PILOT designed the CON-40 to hold 0.4ml, a visible air bubble is expected when first filling it straight from the ink bottle. This air bubble will not affect ink flow, especially with the steel balls in the converter, which ensure ink flows optimally when writing.

However, you can achieve a fuller fill by priming the feed of your fountain pen.
Without taking the nib out of the ink bottle, empty out the first fill of ink by twisting the knob anti-clockwise and refill it once more by twisting it back clockwise.
You will find that the ink that remained in the feed with your first fill will displace the air bubble and more ink will be pulled into the converter.