˙Placed in liquid nitrogen or dry ice, so that the air drawn by the vacuum pump is condensed by liquid nitrogen or dry ice to condense the water vapor or volatile solvent in it to protect the pump from corrosion
˙Suitable for 1 liter POPE liquid nitrogen cylinder
˙The outer diameter of the bottle body is 50mm, the grinding mouth is 45/50, and the length below the grinding mouth is 250mm