2 Pack 500ml Flat Bottom Boiling Flask 24/40 Lab Distillation Boro Glassware Set por | Jul 24, 202624/40 standard taper outer joint fits common distillation adapters and condensers. Size 500ml. Suitable fordistillation, mixing solvents, and Soxhlet extraction (as boiling or receiving flasks). 🧪Designed for lab apparatus.