The CON-40 represents the gold standard for fountain pen ink conversion, engineered to work seamlessly across Pilot and Namiki's current lineup. This piston-style mechanism delivers superior ink capacity and control compared to cartridge alternatives. The integrated metal agitators—four precision components positioned within the barrel—actively disrupt air pockets that compromise ink delivery, guaranteeing uninterrupted flow throughout your writing session. For discerning pen users seeking reliability and refillable convenience, this converter is an essential accessory.