The Pilot Namiki Piston Converter delivers reliable ink capacity for serious fountain pen users. This push-button, plunger-vacuum style converter features a sophisticated piston mechanism that draws ink directly from bottles, eliminating the need for disposable cartridges. Measuring approximately 3 inches with a refined black cap, it's engineered for seamless compatibility with Namiki and Pilot fountain pens. Ideal for those who prefer bottled inks and value precision engineering in their writing instruments.