Jointed glass flasks are a mainstay of many glassware systems. Their use in numerous chemistry applications means that jointed flasks are manufactured in a great variety of styles. The number of necks can vary from one to four, and practically every joint size is available, including common sizes like 14/20 and 24/40.
A common type of jointed glass flask is the ubiquitious round bottom flask, which is often used as a boiling flask in heating mantles or as a distilling flask in rotary evaporators. Receiving flasks and recovery flasks are also prevalent, and are used in botanical extraction systems to collect output.