The Omnipure CL10RO inline water filters contain coconut shell granular activated carbon to reduce chlorine taste and odor. Coconut shell carbon provides better tasting water than regular carbon inline filters. Typically used in ice machines, water coolers, drinking fountains, under sink systems, and reverse osmosis systems. Specifications Dimensions: 2" W X 10" L Flow Rate: .5 GPM Filter Life: 1 year Maximum Pressure: 125 PSIG Maximum Temperature: 100 F Pipe Size NPT: 1/4" and 3/8" Media: Coconut Shell granular activated carbon **Interchangeable carbon media in T28, T33 and T40 National Pipe Thread (NPT) Size Measured Against a Ruler* Actual Diameter (Inches) National Pipe Thread (NPT) (Fractional) 0.405" 1/8" 0.540" 1/4" 0.675" 3/8" 0.840" 1/2" *NOTE: A very common misconception is that a 1/4" NPT measures as 1/4 inch on a ruler or tape measurer. However, that is not the case. NPT will measure larger in diameter. Above is a sizing reference to help clarify.