Key Takeaways
- Trudell sells single AeroKat replacement masks for $21.99 each, available only in Small and Medium sizes directly from trudellanimalhealth.com.
- Third-party retailers charge $15–$25 per mask but routinely list 4–6 week shipping windows, leaving asthmatic cats untreated for over a month.
- Only the face mask and Flow-Vu indicator are realistically replaceable; the chamber body, valve, and MDI port are not sold separately by the manufacturer.
- If two or more parts need replacing, a full Neobay chamber at $33.99 with two masks and a flow indicator costs less than sourcing two AeroKat masks alone.
- Replace the mask every 6–12 months when silicone loses its seal, curls at the edge, or causes fur loss around your cat's nose.
You reached for the AeroKat this morning and the mask was on the floor. The dog got it. Or it cracked in the sink. Or you simply can't remember which room you left it in. Now you have a prescribed inhaler, a chamber with no mask, and a cat who needs his afternoon dose in three hours. Here's the short version: you have more options than the AeroKat box implied. Some are quick, some are surprisingly expensive, and one — replacing the whole chamber — makes more financial sense than most cat owners realize. Let's walk through what's actually replaceable, where to buy it, and when to stop patching and start over.
What Parts Can You Actually Replace on an AeroKat?
Trudell Animal Health designed the AeroCat Aerosol Chamber as a sealed unit, but they sell two replacement components separately:
- The face mask — the soft silicone piece that seals against your cat's face. Sold individually in Small, Medium, and Large sizes. This is the part most owners need.
- The Flow-Vu indicator flap — the colored movement indicator that shows your cat is inhaling. Less commonly replaced, but available through Trudell customer service.
What you cannot buy as a standalone part: the chamber body, the one-way valve inside, the rubber MDI port that holds the inhaler, and the outer casing. When any of those fail, you're buying a complete new unit. Trudell does not publish a service manual or sell internal components, and disassembling the chamber voids the warranty.
This matters more than it sounds. If your mask is fine but the valve sticks, no amount of replacement-part shopping will fix it. You're in full-chamber territory.
Where to Buy Replacement AeroKat Masks
I checked every retailer listing AeroKat replacement masks in July 2026. Here's what's actually in stock and what you'll pay:
| Source | Price (single mask) | Sizes | Shipping | Catch |
|---|---|---|---|---|
| Trudell (official) | $21.99 | S, M | 3–7 days | Large not sold direct |
| Hardy Paw | $15.25 | L only | 4–6 weeks | Long wait, large cats only |
| CPR Savers | ~$18 | Small only (1.5″) | 5–10 days | Limited size range |
| Chewy | Not sold | — | — | Sells full chamber only |
| Breatheazy (UK) | £12–£15 | XS, S, M, L | UK only | Best option if you're in Europe |
Two patterns jump out. First, no single retailer stocks every size — you may need two sources to cover a multi-cat household. Second, the cheapest listed price (Hardy Paw at $15.25) comes with a 4–6 week shipping delay, which is useless for a cat actively coughing. For most US owners, ordering direct from Trudell at $21.99 is the realistic fastest option.
When Replacing Parts Stops Making Sense
Here's the math most cat owners don't run until they're on their third replacement mask.
A single AeroKat replacement mask is $21.99. If you need two — say a Small for your kitten and a Medium for your adult cat, or a backup because the first one tore — you're at $43.98 in masks alone, on top of the $110+ you already paid for the original chamber. Add a new Flow-Vu indicator (call Trudell for pricing) and you're approaching $60 in replacement parts for a chamber you already own.
Neobay Cat Aerosol Chamber with Comfort Feeder — Green
- Visual Flow Indicator
- Comfort Feeder Design
- One-Way Valve
For comparison, the Neobay Cat Aerosol Chamber ships as a complete unit — chamber, two masks, and a built-in visual flow indicator — for $33.99. If you're replacing more than one AeroKat component, buying a complete Neobay unit is cheaper than sourcing two replacement AeroKat masks. The trade-off: you're switching to a different brand rather than keeping the AeroKat you already trained your cat on. For some owners that matters. For others, especially those early in treatment, the savings are hard to ignore.
Signs You Should Replace the Whole Chamber
Sometimes the answer isn't a new mask. It's a new chamber. Look for these signals:
- The mask edge curls or won't lay flat — silicone fatigues after 6–12 months of daily washing, and no amount of cleaning restores the seal.
- Fur loss around your cat's nose — a frequent complaint in cat-owner forums, usually caused by mask friction or dried medication residue. Replace the mask and rinse it after every use.
- The Flow-Vu indicator sticks or doesn't move — this means the valve inside is failing, and the valve is not a replaceable part.
- The MDI port cracks or loosens — the rubber fitting that holds the inhaler can deform over time, leaking medication before it reaches the chamber.
- Your cat has outgrown the mask size — kittens diagnosed early often need to step up from Small to Medium within a year.
If you're seeing two or more of these, replacement parts won't solve it. Start comparison-shopping for a full chamber.
Frequently Asked Questions
Can I buy just the green mouthpiece part of the AeroKat?
No. Trudell does not sell the MDI port (the green piece that holds the inhaler) separately. If it cracks or the rubber loosens, you need to replace the entire chamber. Some owners in cat asthma communities have asked about DIY fixes, but Trudell confirms opening the unit voids the warranty.
Are AeroKat masks interchangeable with other brands?
Not reliably. AeroKat masks are sized to fit the AeroKat chamber's diameter. Generic spacers, baby inhaler chambers like the AeroChamber, and the Neobay chamber use different fittings. Forcing a mismatched mask onto a chamber can break the seal and cause medication to leak before your cat inhales it.
How often should I replace the AeroKat mask?
Every 6 to 12 months with daily use. Sooner if you see visible cracking, curling at the edge, or fur loss on your cat's face. Rinsing the mask with warm water after each use and letting it air dry extends the lifespan — dried medication residue breaks down the silicone faster.
Is it cheaper to buy replacement masks or a whole new chamber?
If you only need one mask, replacing it at $21.99 is cheaper than a new chamber. If you need two masks, or a mask plus any other part, you cross the threshold where a complete new unit like the Neobay at $33.99 becomes the better value.
Does Chewy sell AeroKat replacement parts?
No. Chewy carries the full AeroCat chamber kit but does not stock individual masks or parts. For replacement masks, order direct from Trudell or from a specialty retailer like Hardy Paw or CPR Savers.
What if my cat needs a Large mask?
Trudell does not sell the Large mask direct in the US market — only Small and Medium. For Large cats (over 10 lb), Hardy Paw carries it at $15.25 but ships in 4–6 weeks. Plan ahead, or consider a chamber that ships with a Large mask included.
What to Do Next
- Identify the exact part you need — is it just the mask, or is the chamber itself showing wear?
- If it's just one mask, order from Trudell direct for the fastest shipping at $21.99.
- If you need multiple parts or your chamber is aging, compare full-unit options — see our AeroKat vs Neobay comparison for a side-by-side breakdown.
- While you wait, read our cleaning and maintenance guide — proper care extends the life of every part you just bought.
Replacing an AeroKat mask shouldn't be a research project. If you're spending more than $40 in parts, the math usually points to a fresh chamber. See if the Neobay complete chamber fits your cat's treatment plan, or visit our FAQ page for more on feline asthma management.
Have questions about compatibility or sizing? Contact us directly — we talk to cat owners about inhaler spacers every day.
Sources
- Trudell Animal Health. "Replacement Masks - Cats." trudellanimalhealth.com, 2026.
- Hardy Paw. "AeroKat Replacement Mask Product Listing." hardypaw.com, 2026.
- Chewy. "Trudell Animal Health AeroKat Cat Asthma Aerosol Chamber — Customer Q&A." chewy.com, accessed 2026.
- Cornell Feline Health Center. "Asthma in Cats." Cornell University College of Veterinary Medicine.
- Trudell Animal Health. "AeroCat Aerosol Chamber User Manual," 2024 edition.
Related Reading
This article is part of our What Is a Cat Inhaler Spacer? — covering device types, how to use them, proper technique, cleaning, and troubleshooting.
