Isopure Water
Isopure Water (ISO-4PK) Reverse Osmosis RO 4 Filter Replacement Set
$18.99
A full 4 piece replacement set for a standard/conventional reverse osmosis system. Including the following:
- ISO-RO5
- ISO-RO4DI
- W-525
- W-425
- AND MANY OTHERS
Four set package includes:
- one GAC cartridge filter
- one carbon block 5 or 10 micron filter
- one sediment 5 micron filter
- one post inline GAC filter
| 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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