4204490 Refrigerator Water Filter Replacement
The Sub-Zero 4204490 — also sold as 9030868, 4290510 — is a 0.5-micron carbon-block filter certified to NSF/ANSI 42. It reduces chlorine taste & odour, sediment, rust, particulates for up to 12 months. Below are every fridge it fits, its cross-reference codes, and the cheapest verified compatible options.
Also known as (cross-reference)
Same filter, different part numbers — all interchangeable.
Fits these Sub-Zero fridge models
Tap your model to confirm the exact match and see all options.
How to replace the 4204490
Takes about 5 minutes, no tools. The steps are the same for the OEM 4204490 and any certified equivalent.
1. Locate the filter
On most Sub-Zero fridges the 4204490 sits inside the top-right of the fresh-food compartment, in the bottom base grille, or lower rear. Check your manual if unsure.
2. Release the old filter
Turn the old cartridge a quarter-turn counter-clockwise, or press the release button, and pull it straight out. A little water drip is normal.
3. Prep the new filter
Unwrap the new 4204490 (or a certified equivalent) and remove the protective caps from the O-rings.
4. Insert and lock
Push the new filter in and turn clockwise until it clicks or the arrow lines up. It should seat firmly without forcing.
5. Flush the line
Run 2–4 gallons (about 4 minutes) through the dispenser to clear harmless carbon fines and air, until the water runs clear.
6. Reset the indicator
Press and hold the filter-status button for ~3 seconds until the light turns from red back to blue/green.
Signs it's time to replace it
Swap the 4204490 when you notice any of these — don't wait past 12 months.
Slower dispenser
Taste or odour returns
Filter light is red
Out of stock? Verified alternatives
If the 4204490 is unavailable, these fit the exact same fridges.
Identical filter, other part numbers
Certified compatible brands
Always confirm the alternative lists your fridge model before buying.
Frequently asked questions
What filters are compatible with the 4204490?
The 4204490 is also sold under the codes 9030868, 4290510. Certified compatible replacements from brands like Waterdrop, GlacialPure, AquaCrest fit the same fridges and typically cost less than the OEM part.
Which refrigerators does the 4204490 fit?
It fits Sub-Zero models including BI-36U, BI-42SD, BI-48SD, 648PRO, IT-36CIID and others. Enter your model number to confirm the exact match.
How often should I replace the 4204490?
Replace every 12 months or about 600 gallons, whichever comes first, to keep contaminant reduction and flow rate at spec.
Is the 4204490 NSF certified?
Yes — it is certified to NSF/ANSI 42, reducing chlorine taste & odour, sediment, rust and more.