302 x 140 Dimension One Crystal Pure Ozone Replacement CartridgeDimension One Crystal Pure Ozone Replacement Filter Cartridge. Has a open top and bottom with the top having a a slightly smaller hole and a ring around the top of it. The top ring contains 12 holes around it and the filter is core less. Filter dimensions: Height 302mm(end to end not including top ring), Width 140mm, Hole ID Top 50mm, Hole ID Bottom 72mm. Commonly used on the Crystal Pure System Box QTY: 9