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Isopure Water

Isopure Water (ISO-5PK) Universal Reverse Osmosis (RO) 5 Filters Plus Membrane Replacement Set

Product Code ISO-5PK

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A full 5 piece replacement set for a standard/conventional reverse osmosis systems.

Including the following:

  • ISO-RO5
  • W-525
  • W-425

Five set package includes:

National Pipe Thread (NPT) Size Measured Against a Ruler*
 Actual Diameter
National Pipe Thread (NPT)
0.405" 1/8"
0.540" 1/4"
0.675" 3/8"
0.840" 1/2"

*NOTEA 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.