Pyrex Heavy Wall Filtering Flask

These flasks, with tubulation, are blown in special molds, in shapes designed to give maximum mechanical strength. For convenience, the flasks are graduated to show approximate capacity. The neck finish affords and excellent fit for rubber stoppers. Tabulation O.D. on sizes up to 1000mL is 10mm. Tabulation for 2000mL and 4000mL is 12.5mm.