... 1.Size:Dia25,38,50,76mm 2.Material:carbon steels,aluminium,copper,bronze,ss304L,316L 3. low pressure drop Metal VSP rings ... the packing bed.Materials:stainless steels,carbon steels,aluminium,copper,bronze,304L,316L and aluminium permeated steels,improved polypropylene,improved Nylon6,Nylon66,reinforce ...