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100 Micron Polypropylene Melt Blown Cartridge, 99% Efficiency at Designated Microns, 2.5″ diam x 40″Long, Polypropylene Core, Double Open Ends, Silicone O-Ring. Packed 25 per box (Sold in box qty only). Priced per each. WQA certified and tested to meet NSF/ANSI 61 and more