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The ''hump filler'' is basically a variation on the theme of the [[crescent filler]] in which the sac is compressed using a protruding element from a side opening of the pen. The element allows you to compress directly the rubber sac, the main differences between the variants of this filling system are the ways in which it ensures, more or less reliably, that the protrusion can not be pressed accidentally.

The ''hump filler'' is basically a variation on the theme of the [[crescent filler]] in which the sac is compressed using a protruding element from a side opening of the pen. The element allows you to compress directly the rubber sac, the main differences between the variants of this filling system are the ways in which it ensures, more or less reliably, that the protrusion can not be pressed accidentally.

The system had some diffusion at the beginning of 1900, as an alternative to the success of the [[Conklin]] [[crescent filler]], one of the best realized versions was the so-called ''[[Wawco]] filler'' conceived by William Welty (patent {{Cite patent|US|834542}}) and used for the pens produced by the latter both with the [[Wawco]] brand and with the other brands used by the company.<noinclude>

The system had some diffusion at the beginning of 1900, as an alternative to the success of the [[Conklin]] [[crescent filler]], one of the best realized versions was the so-called ''[[Wawco]] filler'' conceived by William Welty (patent {{Cite patent|US|834542}}) and used for the pens produced by the latter both with the [[Wawco]] brand and with the other brands used by the company.<noinclude>