Copper Pall ringBy minimizing the number of contours and crevices that can cause liquid hold-up and potential entrainment, the Metal Pall Ring geometry enables high gas and liquid transfer rates. The opened cylinder walls and inward bent protrusions allow greater capacity and lower pressure drop than standard cylindrical rings. This open ring design also maintains an even distribution and resists wall-channeling tendencies. The interior and exterior contacting surfaces of the pall ring provide for an effective distribution of liquids and gasses and resist plugging, fouling and nesting.