PE, double open-ended.

These sample cups have two 'Snap-On Rings' . One of which allows microporous film attachment to the upper cell neck for pressure equalization within the sample cup and sample chamber and the other is used to attach a thin-film window to the lower end of the cell. Both 'Snap-On Rings' are designed with a 'bead-to-indent' geometry for establishing taut and leak-resistant sample windows.