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.

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.