漏斗的设计允许向快速色谱柱添加溶剂，而不会干扰硅胶/填料层。漏斗的下端是封闭的，杆上有一系列小孔，溶剂通过这些小孔排出。漏斗顶部直径为75毫米（3英寸），阀杆尺寸如表所示。

Design of funnel permits addition of solvents to flash chromatography columns without disturbing the silica-gel / packing layer. Lower end of the funnel is closed and the stem has a series of small holes through which the solvent drains. Top of the funnel is 75mm (3in) in diameter with the stem size as listed.