This 5000mL filtering flask is made from heavy-walled borosilicate 3.3 glass, designed to withstand the pressure of vacuum filtration. The flask features white printed graduation lines every 500mL and an integral barbed side arm for attaching vacuum tubing. The inside bottom is perfectly flat for compatibility with rotating stir bars. The flask measures 15 inches tall with a 9-inch diameter base. The neck has an inner diameter of 52mm (2 inches) and an outer diameter of 60mm (2.4 inches), accepting a #11 stopper (not included). The side arm measures 1.6 inches long with a 12mm outer diameter and 5mm inner diameter. The borosilicate glass is autoclavable with heat tolerances including a Strain Point of 515°C, Annealing Point of 565°C, and Softening Point of 820°C.