7) Vaccuumfiller, Wahl-Eversharp 1935 back A rubber seal, mounted on a rod is pushed down the tightly sealed upper part of the barrel, thus creating a vacuum behind the rubber seal. When reaching the final position short before the grip section, the inner diameter of the barrel widens, and the vacuum draws the ink.   The A.W. Faber Wertfüller, equipped with a variation of the Vacuumfilling system. A Plunger Filler, as it has been made by Wahl Eversharp and Sheaffer. Today, Visconti uses this principle.