Storage flask sidearm has a 9mm OD tubulation for use with 3/8" Cajon connections. valve is used to control gas or liquid flow into the vessel.
Flasks are heavy wall designed, made by hand-blowing to ensure uniform wall thickness, made of high-quality borosilicate glass 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.