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.

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🐱 Unlock a zen den for your cats—because calm is the new cool!

LONG LASTING PEACE - Six refills provide up to 180 days of pheromone-powered harmony in your home.
SAFE EASY TO USE - UL-certified diffusers with shut-off and rotatable plug ensure hassle-free, worry-free operation.
MULTI CAT HOUSEHOLD SAVIOR - Specifically designed to ease stress and conflict in homes with multiple cats.
DRUG FREE BEHAVIOR SOLUTION - Natural calming without chemicals—reduce spraying, scratching, and tension effortlessly.
VETERINARIAN RECOMMENDED CALM - Trusted by experts to keep your cats safe, happy, and stress-free.

Comfort Zone 6 Refills offer a veterinarian-recommended, drug-free pheromone solution designed to reduce stress-related behaviors like spraying, scratching, and fighting in single or multi-cat homes. Each pack includes six refills that last up to 180 days, compatible with all Comfort Zone diffusers featuring UL safety certification and user-friendly design.

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€ 72.21

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Irelandstore

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TrustScore 4.5 | 7,300+ reviews

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Product Dimensions	14.3 x 9.37 x 9.04 cm; 358 g
Item model number	100538644
Pet Life Stage	All Life Stages
Allergen Information	Yam Free
Color	RED
Size	6-Pack
Number of Items	1
Quantity	1
Storage Information	Store at room temperature
Special Features	cat behavior, diffuser, cat anxiety, cat calming, feliway
Specific Uses	Behavior
batteries required	No
Batteries Included	No
Item Weight	358 g

Comfort Zone6 Refills | Multi-Cat Diffuser Refills (Value Pack) for a Peaceful Home | Veterinarian Recommend | Stop Cat Fighting and Reduce Spraying, Scratching, & Other Problematic Behaviors

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