Your Sub-Zero refrigerator depends on both a water filter and an air purification cartridge working together to deliver clean water and a consistently fresh interior environment. If you are looking at the 4204490 and 7007067 combo pack and are not completely sure it is the right replacement for your unit, this guide will walk you through exactly how to confirm compatibility before buying so you can order with confidence and avoid a costly mismatch.
Why Sub-Zero Combo Pack Numbers Can Be Confusing
Sub-Zero refrigerators use both a water filter and an air purification cartridge, and different model generations use different cartridge combinations. Here is why buyers frequently run into confusion when searching for the right combo pack replacement:
- Both combo packs share the same 4204490 water filter but pair it with different air cartridges, making it easy to order the wrong combo if you only check the water filter part number and not the air cartridge
- The 7007067 and 7042798 air cartridges look physically similar but are designed for different Sub-Zero model generations and are not interchangeable, so ordering by appearance rather than part number leads to a mismatch
- Searching broadly for a Sub-Zero combo pack without specifying both part numbers often returns results for both combo variations, leaving buyers unsure which one applies to their specific refrigerator
- Older Sub-Zero models may show worn or faded cartridge labels making it difficult to read the correct part number without removing the existing cartridge entirely
- Some product listings group multiple compatible codes together which can make it unclear whether the 7007067 or the 7042798 is the correct air cartridge for a specific refrigerator model
Confirming both part numbers before ordering is the single most important step in avoiding a compatibility issue with a Sub-Zero combo pack.
Where to Find Your Sub-Zero Filter and Cartridge Part Numbers
Follow these steps to locate the correct part numbers for both the water filter and air cartridge in your Sub-Zero refrigerator:
- Check the existing water filter label — the part number is printed directly on the filter currently installed in the housing. If it shows 4204490, the water filter component of this combo is confirmed
- Check the existing air cartridge label — the part number is printed on the cartridge itself. If it shows 7007067, this combo pack is the correct replacement for your unit
- Check inside both housing slots — some Sub-Zero models print the required part numbers on labels inside the filter and cartridge housing slots themselves
- Check the refrigerator model plate — the model number is typically located on a label inside the fresh food compartment along the upper door frame or side wall. Use the model number to cross-reference compatibility for both components
- Check the refrigerator user guide — the maintenance section lists the correct replacement part numbers for both the water filter and air cartridge for your specific Sub-Zero model
- Search by refrigerator model number — if either label is worn or unreadable, entering your refrigerator model number into the compatibility lookup on the retailer page confirms the correct part numbers for both components
What Is the Sub-Zero 4204490 Water Filter?
The Sub-Zero 4204490 is an NSF 42 and 53 certified replacement water filter designed for select Sub-Zero refrigerator models. It uses activated carbon block filtration to reduce chlorine taste and odor, lead, heavy metals, VOCs, and sediment before water reaches the dispenser or ice maker. The 4204490 has a service life of 300 gallons or 12 months, whichever comes first, and uses a twist-in installation design that requires no tools. It is the water filter component shared across both Sub-Zero combo pack variations.
What Is the Sub-Zero 7007067 Air Purification Cartridge?
The Sub-Zero 7007067 is a replacement air purification cartridge designed for select earlier generation Sub-Zero refrigerator models. It uses activated carbon filtration to continuously reduce food odors and ethylene gas that accelerates produce spoilage inside the refrigerator compartment. The 7007067 uses a snap-in installation design, requires no tools to replace, and carries a recommended replacement interval of 12 months. It is the air cartridge component specific to this combo pack and is not interchangeable with the 7042798 used in the other Sub-Zero combo pack variation.
What Is the Sub-Zero 7042798 Air Cartridge and Why Does It Matter Here?
The Sub-Zero 7042798 is the air cartridge used in the alternative Sub-Zero combo pack variation paired with the same 4204490 water filter. It performs the same function as the 7007067 but is designed for newer generation Sub-Zero refrigerator models with a different housing format. Understanding the distinction between the 7007067 and 7042798 is the key to ordering the correct combo pack for your unit. If your existing air cartridge shows 7042798 rather than 7007067, the 4204490 and 7042798 combo pack is the correct replacement, not this one.
Compatibility Checklist Before Buying the 4204490 & 7007067 Combo Pack
Run through this checklist before placing your order:
- Does your existing water filter show the part number 4204490? If yes, the water filter component of this combo is confirmed
- Does your existing air cartridge show the part number 7007067? If yes, this combo pack is the confirmed replacement for your unit
- Does your refrigerator model appear on the 4204490 and 7007067 compatibility list? Cross-reference your model number before ordering
- Is your refrigerator from an earlier Sub-Zero production generation? The 7007067 is designed for select earlier generation Sub-Zero configurations
- Does your existing air cartridge show 7042798 instead of 7007067? If yes, the 4204490 and 7042798 combo pack is the correct replacement, not this one
- Has it been 12 months or 300 gallons since the last water filter replacement? If yes, replacement is due for both components regardless of whether water taste or refrigerator odor has changed noticeably
Common Mistakes When Buying a Sub-Zero Combo Pack
These are the most frequent ordering errors that lead to compatibility issues and returns:
- Checking only the water filter part number and not the air cartridge — both combo packs share the same 4204490 water filter, so confirming only the water filter number is not enough to determine which combo pack is correct for your unit
- Assuming the 7007067 and 7042798 are interchangeable — they are not. Always confirm the air cartridge part number on the existing cartridge before ordering
- Ordering a combo pack when only one component needs replacing — if only the water filter or only the air cartridge is due for replacement, individual replacements are available. The combo pack is most practical when both components are due at the same time
- Relying on physical appearance rather than part number — air cartridges from different Sub-Zero generations can look nearly identical but have housing tolerances that differ enough to prevent a proper seal
- Not flushing the water filter after installation — running 2 to 3 gallons through the dispenser after installing the 4204490 clears carbon fines and trapped air and ensures clean water from the first use
- Forgetting to note the installation date for the air cartridge — most Sub-Zero models do not include a dedicated air cartridge indicator light. Writing down the installation date at the time of replacement is the most reliable way to track the 12 month replacement schedule
When Should You Replace the Sub-Zero 4204490 & 7007067 Combo Pack?
Replace both components in the combo pack when any of the following apply:
- It has been 12 months since the last replacement — this is the primary trigger for both the water filter and air cartridge
- The water filter has reached 300 gallons — households with higher water consumption may reach this mark before the 12 month period is up
- Dispensed water develops a flat taste or noticeable odor — a sign the 4204490 carbon block is no longer reducing chlorine and contaminants effectively
- Persistent food odors develop inside the refrigerator between cleanings and after removing strongly scented food
- Stored produce is spoiling faster than expected — ethylene gas buildup from an exhausted 7007067 cartridge accelerates ripening in nearby fruits and vegetables
- The filter indicator light activates on the Sub-Zero control panel — act on this promptly rather than waiting for taste or odor changes to confirm replacement is due
Recommended Sub-Zero Combo Pack Replacement
If your Sub-Zero refrigerator uses both the 4204490 water filter and the 7007067 air cartridge, you can view the compatible combo pack replacement and confirm availability here.
View Sub-Zero 4204490 & 7007067 Combo Pack from purefridgewater.
FAQs
How do I know if my Sub-Zero refrigerator needs the 7007067 or the 7042798 air cartridge?
Check the part number printed on the existing air cartridge currently installed in your refrigerator. If it shows 7007067, this combo pack is the correct replacement. If it shows 7042798, the 4204490 and 7042798 combo pack is the correct replacement for your unit.
Can I replace just the water filter or just the air cartridge instead of buying the combo pack?
Yes. Both the 4204490 water filter and 7007067 air cartridge are available as individual replacements. The combo pack is the most practical option when both components are due at the same time, which for most households falls at the 12 month mark.
Does the 4204490 water filter in this combo also filter ice maker water?
On most compatible Sub-Zero refrigerator models the 4204490 serves both the water dispenser and the ice maker from a single filter housing. Confirm this against your specific model in the Sub-Zero user guide to verify whether the 4204490 covers both functions on your unit.
Why does my refrigerator still smell after replacing the 7007067 air cartridge component of this combo?
A new cartridge reduces airborne odor compounds but does not remove odors embedded in refrigerator surfaces or food containers. Wipe down interior surfaces, remove any spoiled food, and allow 24 to 48 hours for the new cartridge to reach full adsorption capacity before concluding there is a problem.
Is there a filter indicator light for the 7007067 air cartridge on Sub-Zero refrigerators?
Most Sub-Zero models do not include a dedicated air cartridge indicator light. Writing down the installation date at the time of replacement and setting a calendar reminder at the 12 month mark is the most practical way to stay on the annual replacement schedule for the air cartridge component.
Where can I find more detail on the difference between the two Sub-Zero combo pack variations?
The Sub-Zero 4204490 and 7007067 combo pack landing page includes a full head to head comparison table covering both combo pack variations side by side to help you confirm the correct one before ordering.