・ It is one of the most common “return cooler” (Reflux Condenser).
・ It is mainly used in combination with other glass equipment when distillation or return (relax).
・ Red the cooling water to the outside of the double tube structure, cooled the steam inside and condensed (liquefied).
・ Because the inner tube is straight, it is a cooler that is often used in a slope (diagonal) because the condensed solution does not accumulate even if it is diagonally.