Cylindrical, heavy wall reaction flasks (or kettles) have an integral fritted disc and bottom tube outlet

The top of the flask has a flat flange with a groove designed for use with an O-Ring. The 1000mL flasks are equipped with a ⅝" bottom tube O.D., and the 4000mL and 6000mL flasks feature a 1¼" bottom tube O.D. The flasks can be used with two-piece clamps (such as 89055-038 or 89055-040) or quick release clamps (such as 89055-110). For heads, see items such as 89055-320, 89055-330, and 89055-370 (among others). Fabricated from borosilicate glass.