Application: (1) Reactors between liquids and solids or liquids; (2) Assemble a gas reaction generator (at room temperature, heated); (3) Distillation or fractional distillation of liquids (also known as distillation flasks with branch tubes); Standard neck openings of 17, 19, and 24mm, each with a plug. Detachable for cleaning, with smooth inner walls; The lid and body, as well as the necks and lids, are threaded connections for easy disassembly and cleaning.