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Manufactured with high purity coconut shell carbon and are available in a wide range of lengths, diameters, and micron ratings. Hydronix CB6 series carbon block filters provide an excellent cost-to-performance value. With high chlorine reduction, great dirt-holding capacity, and greatly reduced carbon fines, you will soon make the CB6 series your carbon block of choice. 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.
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🇺🇸 Ship from USA · On Agora since 2025
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