Certain types of Karl Fischer vessels require the use of Karl Fischer grease. Vessels with smooth port openings need a thin layer of the grease applied to plugs, electrodes, dessicant tubes, bubbler tubes and injection port plugs to help form a snug fit. Decreasing or limiting "ambient moisture" from getting into the vessel - otherwise known as "drift" - is the key benefit of using Karl Fischer grease. Another benefit of Karl Fischer grease is that it also helps prevent chipping of glass on glass fittings. Watch this short video to see how Karl Fischer Grease should be applied.