The Omnipure K-Series K5605 inline filter is a 5 micron sediment inline filter. This filter comes in 1/4" FQC, 1/4" FPT, and 1/4" FQC 90 Elbow quick connect fittings that make this filter really easy to install and remove. This filter can be used in ice makers, refrigerators, beverage equipment, drinking fountains, under the counter systems, R.O.Systems and in conjunction with purification systems. This filter aids in the removal of dirt, sand, and sediment. Dimensions: 2.5" W X 12" L Flow Rate: .5 GPM Maximum Pressure: 125 PSI Maximum Temperature: 100 F Rating: 5 Micron Rating Features: Polypropylene depth filtration Fitting Size: 1/4" FQC, 1/4" FPT, and 1/4" FQC 90 Elbow 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.