Check the listing for details. Lab Half Jacketed Round Bottom Flask Heavy Wall PTFE Stopcocks,. Condition: New. Listed at 188.00 USD. Lab Half Jacket Three Necks Round Bottom Flask 24/40 ,removable connectors Round bottom, HEAVY WALL, three neck flask with standard taper outer joints on the center and side necks. Lower outlet is a 4mm straight bore PTFE stopcock. Flasks with joint sizes other than those listed are available, please call for pricing. Any volume and ground joints would be available,If you need any other size or ground joint,please contact us by the leave an message Our flasks are heavy wall design, made by hand-blowing to ensure uniform wall thickness, and made of high-quality borosilicate glass G3.3 and annealed at 800 degree Celsius, can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling. Handle blowing by the glass blowers,not made by the Pouring If the item will be broken in the delivery process,we will send the replacement to you right now. Be Made From G3.3 Borosilicate GlassAnnealing Point ------560CLinear Coefficient of Expansion------ 32×10-7/CSoftening Point------820C