Vacuum Filler Fountain Pens by Liberum

Explore Liberum Volucris vacuum filler fountain pens in titanium and brass. Learn about bottled ink filling, ink windows and the compact 120 mm format.

What is a vacuum filler fountain pen?

A vacuum filler uses a built-in plunger mechanism to draw fountain pen ink from a bottle into its reservoir. It is a different filling system from a cartridge or a removable converter. Capacity depends on the individual design and filling conditions; a vacuum mechanism alone does not establish a measured ink volume or a guarantee against leaks.

The Liberum Volucris range

Volucris combines vacuum filling with an approximately 120 mm capped length. The titanium model has a green ink window; the brass model has a clear ink window. Both let you inspect the ink supply without opening the barrel. The standard installed nib is #6 stainless steel with a plastic feed, in Extra Fine, Fine, Medium or Broad.

Before choosing a vacuum filler

Use ink specifically intended for fountain pens. Bottled ink and a place to fill the pen are part of the routine, so consider whether that suits your desk, commute or travel. Follow the instructions for the particular model rather than assuming every vacuum filler operates identically. Contact Liberum support if you need model-specific filling or maintenance help.

For a buying comparison with cartridge pens and other compact formats, see the pocket fountain pen guide.

Compare materials and writing weight

Titanium is approximately 41.5 g total and 28.4 g uncapped. Brass is approximately 66 g total and 42 g uncapped. Both share the compact format, but their weight and finish differ. The optional additional nib unit with an ebonite feed is a separate extra component, not a replacement for the standard installed nib.

Read the titanium overview, the brass overview, or browse pocket fountain pens.