Snorkel - stainless steel extension with an adaptor nozzle for the converters most commonly found on the market, to allow you to use even only a few drops of a test ink, so that you do not have to make large amounts of ink but only what you need to fill a converter-cartridge pen once.
Instructions -the front part is for all converters with an international hole, the second, wider part is for Parker, Aurora and Lamy holes, and the final part by the o-ring can be used with Japanese converters such as Pilot.