A stainless steel extension with an adaptor nozzle that fits the majority of common fountain pen converters is called the Pineider Snorkel. Simply insert the nozzle into the converter, insert the extension tube into the ink bottle, and twist to fill. It prevents spills and ink-covered fingertips by keeping your converter full without requiring you to dip your nib into ink. You can also squeeze every last drop of ink into a bottle with the Pineider Snorkel. With the exception of the Platinum and Sheaffer converters, the Pineider Snorkel may be used with the majority of converters.