Sub-Zero 4204490 & 7042798 Combo Pack: Is It the Right Fit for Your Refrigerator?

If your Sub-Zero has a Pure Air button on the control panel, this combo is probably the one you're after. It pairs the standard 4204490 water filter with the 7042798, Sub-Zero's electrically powered air purification cartridge, in a single order.

That Pure Air detail matters more than it might seem. Sub-Zero actually sells two different air cartridges, and mixing them up means ordering a part your fridge's housing can't even use. Let's make sure this combo is the right one before you check out.

Why This Combo Creates Confusion at Replacement Time

The mix-up here usually comes down to one thing: not everyone realizes Sub-Zero's air cartridges come in two different formats. The 7042798 is an active system, part of the Pure Air feature, that electrically cycles and scrubs the air inside the cabinet. The older 7007067 is a passive carbon cartridge that just sits in its housing and absorbs odors on its own. They are not interchangeable, and a fridge built for one won't properly run the other.

On top of that, the two halves of this combo don't wear out at the same pace. Some households assume that because both parts came in the same box, they're due for replacement at the same time. In this specific pairing, both actually run close to a similar window, but it's still worth checking your own usage rather than assuming.

Where to Find Your Part Numbers Before Ordering

1. Locate your current water filter, usually behind the upper right grille panel on a built-in refrigerator
2. Check the label for 4204490, or its cross-referenced codes, 4290510 or 9030868
3. Look at your refrigerator's control panel for a Pure Air button, this is a strong sign your unit uses the 7042798 rather than the 7007067
4. Locate the air cartridge compartment and check the label for 7042798
5. If either label is unreadable, note your refrigerator's model and serial number, usually found inside the fresh food compartment, and cross-reference them before ordering

What Is the Sub-Zero 4204490 Water Filter

The 4204490 is Sub-Zero's standard refrigerator water filter, built for the Classic, Designer, Integrated, and Built-In series along with the Pro line. It's NSF 42 and ANSI certified, reducing chlorine taste and odor along with sediment and other contaminants, and it includes a built-in scale inhibitor that helps protect your dispenser lines from mineral buildup over time. It's rated for 750 gallons or 12 months, whichever comes first, and installs with a quick quarter-turn, no tools needed.

What Is the Sub-Zero 7042798 Air Cartridge

The 7042798 is Sub-Zero's electrically powered active air purification cartridge, built for units with a Pure Air compartment and control panel button. Rather than passively sitting there absorbing odors, it actively cycles and scrubs the air inside your fridge on a regular interval, cutting down on airborne bacteria, mold, and ethylene gas along with everyday food odors. It's rated for roughly six months of use and installs by rotating open the cartridge cover, inserting the new cartridge, and resetting the Pure Air indicator.

Is the 7042798 the Same as the 7007067

No, and this is the detail worth double checking before you order either combo. The 7042798 requires an electrically wired housing and a Pure Air control button, since it's an active system rather than a passive one. The 7007067 doesn't need any of that, it simply snaps into a standard housing. If your Sub-Zero has the Pure Air button, this combo with the 7042798 is correct. If it doesn't, you'll want the combo pairing the 4204490 with the 7007067 instead.

Compatibility Checklist Before Ordering This Combo

• Confirm the water filter label shows 4204490, 4290510, or 9030868
• Confirm your control panel has a Pure Air button
• Confirm the air cartridge compartment is electrically wired, not a simple snap-in slot
• Confirm the air cartridge label, if visible, shows 7042798
• Confirm your Sub-Zero is a Classic, Designer, Integrated, Built-In, or Pro series model

If all five points check out, this combo is your match. If your fridge doesn't have a Pure Air button, stop here and look at the combo pairing the 4204490 with the 7007067 instead.

Common Mistakes When Buying This Combo

Ordering based on how "new" the fridge looks rather than checking for the Pure Air button. The button on your control panel is a much more reliable indicator than guessing based on your refrigerator's general age or style.

Assuming the 7042798 is simply an upgraded version of the 7007067. They're different technologies built for different housings, not two tiers of the same product. One isn't a direct swap for the other regardless of preference.

Skipping the wipe-down before installing the new cartridge. A quick wipe of any dust off the cartridge before inserting it helps it seat and function properly right away.

Forgetting to hold the Pure Air button long enough to reset it. The reset typically requires holding the button for several seconds, a quick tap alone won't clear the indicator.

Not flushing the dispenser after installing the new water filter. Run 2 to 3 gallons through before drinking to clear out carbon fines left over from manufacturing.

When to Replace Each Half of This Combo

• The water filter is due at 12 months or 750 gallons, whichever comes first
• The air cartridge is due at roughly six months for consistent active purification performance
• Water or ice tasting flat or slightly chemical signals the water filter is overdue
• Noticeable food odors lingering in the fridge, or flavor transfer between stored items, signals the air cartridge is overdue
• Your Sub-Zero's electronic filter monitoring system will flag the water filter specifically once it's time

Ready to Order?

Once you've confirmed your fridge has that Pure Air button and both codes line up, this combo saves you a step and a bit of money compared to ordering each part separately.

Shop the Sub-Zero 4204490 & 7042798 Combo Pack at Hive Appliances

FAQs

How do I know for sure if I need this combo or the 7007067 version?

Check your control panel for a Pure Air button first. If it's there, your fridge uses the electrically active 7042798, and this combo is correct. No button generally means you need the 4204490 and 7007067 pairing instead.

Does the 7042798 actually work better than the older 7007067?

They work differently rather than one being strictly better. The 7042798 actively cycles and purifies air on a schedule, while the 7007067 passively absorbs odors continuously. Which one is right depends entirely on which housing your specific Sub-Zero has.

Can I switch my fridge from the 7007067 cartridge to the 7042798 system?

Not usually. The 7042798 requires an electrically wired Pure Air compartment built into the refrigerator itself, so it isn't something you can add just by ordering a different cartridge.

Does the 4204490 in this combo protect against mineral buildup?

Yes, it includes a built-in scale inhibitor that helps reduce mineral buildup in your dispenser lines over time, something a lot of standard filters don't include.

What happens if I don't reset the Pure Air button after installing the new cartridge?

The system may continue showing the old cartridge as due for replacement, which can be confusing later even though the new cartridge is already installed and working.

Where can I check full specs on each part individually?

Both the 4204490 water filter and the 7042798 air cartridge have their own dedicated product listings at Hive Appliances if you'd like the complete details before ordering.