The Omnipure K-Series K2386 inline filter is a GAC and phosphate inline water filter. It comes 1/4 QC and 3/8" QC fittings that make this filter really easy to install and replace. It aids in the removal of taste and odor in your water also helps remove chlorine taste and odor. Dimensions: 2" W X 6" L Flow Rate: .5 GPM Maximum Pressure: 125 PSI Maximum Temperature: 100 F Service Life: 6 Months or 750 Gallons Filtration Media: Granulated Activated Carbon with Polyphosphate Scale Inhibitor Reduces: Chlorine Taste Odor Reduces: Particulates Class 1 Reduces: Scale and Lime Scale Volume Cubic Inch: 9.5 Fitting Size: 1/4" FQC and 3/8" FQC Omnipure K2386 has been tested for performance under NSF Standard 42. 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.