Two-port reaction bottle, with tetrafluoroid-discharge valve [Purpose] Suitable for chemical plants, pharmaceutical factories, hospitals, schools and other units of the laboratory and industrial equipment, for connecting various devices for the use of the size of the aperture of the piston and the style of the piston, to control the flow of liquids and gases of different devices, flow switch control. Thick holes are mostly used for liquid flow control; Capillary pores are mostly used for gas flow control.