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.

Comfort Zone Multi Cat Calming Diffuser Refill 6 Pack 30

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£100.37

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐾 Unlock the secret to a zen multi-cat home — because calm cats are happy cats!

MONTH LONG CALM - Each refill delivers 30 days of consistent, drug-free pheromone therapy to soothe your cats’ stress.
SAFE CERTIFIED - Meets UL electrical safety standards and is fragrance-free, ensuring a worry-free calming environment for your feline family.
TRUSTED EXPERTISE - Backed by 20+ years of proven cat pheromone science, recommended by pet behavior experts worldwide.
ECO FRIENDLY COST SAVVY - Use with a reusable diffuser that lasts up to 12 months, cutting waste and saving money with 6 refills per pack.
PEACEFUL MULTI CAT HARMONY - Specifically formulated to reduce aggressive behaviors and tension in multi-cat homes, promoting serene coexistence.

Comfort Zone Multi Cat Calming Diffuser Refills provide a drug- and fragrance-free pheromone solution designed to reduce stress and aggressive behaviors in multi-cat households. Compatible with reusable Comfort Zone diffusers, each refill offers 30 days of continuous calming coverage for up to 400 sq ft. Trusted for over 20 years and certified safe, this 6-pack value set supports a peaceful, harmonious environment for cats of all life stages.

Specifications

ASIN	B07MW3DG5M
Allergen Information	Yam Free
Batteries Included	No
Batteries required	No
Best Sellers Rank	249,711 in Pet Supplies ( See Top 100 in Pet Supplies ) 333 in Relaxants & Anxiety Relief for Cats
Colour	RED
Customer Reviews	4.5 4.5 out of 5 stars (6,772)
Date First Available	11 May 2019
Item Weight	386 g
Item model number	100538644
Number of Items	6
Pet Life Stage	All Life Stages
Product Dimensions	14.3 x 9.37 x 9.04 cm; 386 g
Quantity	1
Size	6-Pack
Special features	cat anxiety, cat behavior, cat calming, diffuser, feliway
Specific Uses	Behavior, Indoor, Urinary Tract Control
Storage Information	Store at room temperature

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