Do comfortzone refill fit in the feliway difusers?

90% Sure yes. I've been using Comfort Zone & Feliway interchangeably, just what I can get ahold of, and haven't had a diffuser fit problem.

Does the 2x refill work with the original diffuser, I see the outer casing is different, is that needed for the 2x to be effective?

Yes, they are backward compatible.

Do all contain a diffuser?

No, there is no diffuser in this pack. You will see a picture of the diffuser on the front of the package of those that contain a diffuser(s).

How well does it work for indoor cats marking because outdoor strays are driving them crazy?

I've not used these specifically in that situation, though I know exactly how aggravating that is! I've introduced several rescued feral cats into my main group of indoor cats in years past, and only wish I would have had this product back then. I can't say it will fix the problem you're having, but if it were me, I would sure TRY it. I'd saturate the home with the plug-in diffusers, then spray directly on whatever areas your cats are in when they see/hear the outdoor cats. I honestly think it would be worth a try. Right now I have an outdoor kitty who comes and lies up against the door here (I take care of her, feed her, and she has shelter and a heated bed!), but my indoor cats here just lie against the door on the INSIDE when they hear her. No meowing, no crying, no scratching. I'm in a small apartment and two plug-in diffusers seem to work wonders. I personally hope to never be without this product... even my petsitters always remark on how they "can't believe how well everyone in here gets along". Good luck.

Multicat Refills | Desertcart Taiwan

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NT$3841

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Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐾 Keep the peace, skip the stress—calm multi-cat homes start here!

SUBSCRIBE SAVE - Never run out of calm—schedule automatic deliveries and save, so you can focus on what matters: quality time with your cats.
ECO FRIENDLY CALM - Compatible with reusable Comfort Zone diffusers designed to last up to 12 months—reduce waste while keeping cats stress-free.
MONTH LONG SERENITY - Each refill delivers 24/7 calming for a full 30 days, ensuring your multi-cat home stays peaceful without interruption.
VET TRUSTED FORMULA - Backed by 20+ years of expert-recommended cat pheromone care, proven to ease multi-cat tension and aggressive behaviors.
DRUG FRAGRANCE FREE - Safe, natural pheromone solution that mimics cats’ own calming signals—no drugs, no artificial scents, just pure comfort.

Comfort Zone Multicat Refills are monthly pheromone diffuser replacements designed to reduce stress and aggression in multi-cat households. Compatible exclusively with Comfort Zone diffusers reusable for up to 12 months, these drug- and fragrance-free refills provide continuous 24/7 calming for 30 days. Trusted for over 20 years and UL safety certified, they help create a serene environment by mimicking natural cat calming pheromones, reducing behaviors like swatting, scratching, and hissing. Ideal for maintaining harmony in busy cat homes with easy, mess-free use and subscription options for uninterrupted peace.

Specifications

ASIN	B0002DHR1K
Best Sellers Rank	#61,877 in Pet Supplies ( See Top 100 in Pet Supplies ) #41 in Cat Relaxants
Generic Name	2 Packs
Included Components	Comfort Zone 2 Pack MultiCat Diffuser Refills; Cat Calming Pheromones Help Anxiety; 30-day refills
Item Dimensions LxWxH	7.6 x 5.1 x 17.8 Centimeters
Item Weight	132 g
Item model number	100538651
Manufacturer	Comfort Zone
Net Quantity	95.8182 Milliliters
Product Dimensions	7.62 x 5.08 x 17.78 cm; 132 g

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NT$3841

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

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