Sheaffer released this incredibly mechanically complex pen in 1952. The snorkel looked very much like the easy to use, and less mechanically complex Touchdown, on which it was based. The Snorkel was equipped with a retractible tube that ran axially through the feed of the fountain pen. The neat thing about this was that the nib did not have to be dipped in ink, thus creating a need to wipe the pens nib afterward... a sometimes messy job - but a ritual I very much enjoy. The retractible tube was inserted in the ink after unscrewing the top of the barrel (end knob) counterclockwise which makes the metal tube extend under the nib. By pulling out the plunger, inserting the tube into the ink, and then pushing down on the pneumatic filler ink is sucked up the filler tub after a few seconds of being left in the ink. Screw the top of the barrel back on, after turning the end knob clockwise to retract the filler tube, and that is it.