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<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''"stantuffo tuffante"'' is the name given to the filling system invented and patented by [[OMAS]] in 1936 with the introduction of the [[Lucens]] model. In reality, a loading system substantially identical to this and equally functional is found on the pens made by [[Dunn]] dating back fifteen years. For this reason, even if we cannot establish or not the originality of the invention of the [[OMAS]] it is not however correct to assign to it the complete paternity of this type of loading, even if today in Italy we refer to it with the name of ''"stantuffo tuffante"'' for the greater notoriety achieved by the [[Lucens]] compared to the pens of the [[Dunn]] and for the fact that it had not given a specific name to its loading.

<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''"stantuffo tuffante"'' is the name given to the filling system invented and patented by [[OMAS]] in 1936 with the introduction of the [[Lucens]] model. In reality, a loading system substantially identical to this and equally functional is found on the pens made by [[Dunn]] dating back fifteen years. For this reason, even if we cannot establish or not the originality of the invention of the [[OMAS]] it is not however correct to assign to it the complete paternity of this type of loading, even if today in Italy we refer to it with the name of ''"stantuffo tuffante"'' for the greater notoriety achieved by the [[Lucens]] compared to the pens of the [[Dunn]] and for the fact that it had not given a specific name to its loading.

[[File:Omas-ExtraLucens-Rings-MarbledRed-MD-Exploded.jpg|thumb|300px|center|Esploso di una penna a [[stantuffo tuffante]] ]]

[[File:Omas-ExtraLucens-Rings-MarbledRed-MD-Exploded.jpg|thumb|300px|center|Exploded of a [[stantuffo tuffante]] pen]]

Il principio di funzionamento resta quello di tutti i sistemi di caricamento a sfiatatoio, solo che in questo caso la pressione interna al corpo della penna viene esercitata attraverso un pistone cavo cui si accede dal fondello, che presente una parte finale allargata, ma forata al centro in modo da poter scorrere abbondantemente intorno allo sfiatatoio, che in questo caso è molto lungo ed arriva vicino alla fine della penna.

Il principio di funzionamento resta quello di tutti i sistemi di caricamento a sfiatatoio, solo che in questo caso la pressione interna al corpo della penna viene esercitata attraverso un pistone cavo cui si accede dal fondello, che presente una parte finale allargata, ma forata al centro in modo da poter scorrere abbondantemente intorno allo sfiatatoio, che in questo caso è molto lungo ed arriva vicino alla fine della penna.