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Fi Series 3 Compatible Collar Adapter

Fi Series 3 Compatible Collar Adapter

PriceFrom $24.00

Turn any collar into a Fi Series 3 compatible collar!


-Engineered to work with the Fi Series 3 attachment system for a sleek and secure fit
-Precision 3D printed using strong, light, and durable polyester and nylon thermoplastics
-Compatible with nearly every style, including martingale, leather and biothane dog collars
-Adjustable and secure collar attachment using two 12mm double looped velcro straps
-Fits collars as narrow as 5/8" and as wide as 2"
-Charging is made easy by simply removing the Fi Series 3 tracker from the adapter unit. 

**NEW** Upgrade to silicone straps for $3 (Standard size only)


-One Year Free Replacement Warranty
-Free domestic shipping on orders over $40. Expedited USPS shipping upgrades available at check-out. 
-Please allow 6-8 day processing time prior to shipping. We make these in small batches to reduce waste and test each adapter to ensure the highest quality. 
-Proudly designed and manufactured in Sedro-Woolley, WA USA using materials also made in the USA.
-Listing is for the adapter unit only and does not include a Fi tracker or dog collar


Attachment strap sizes for your Fi Series 3 Adapter: 
-Standard: for collars 1.5" wide and smaller
-Large: for collars more than 1.5" wide and up to 2" wide


Perfect for smaller pups who prefer a thinner collar and larger pups who want to keep all their gear on one collar. 


Engineered in-house, precision 3D printed and field-tested for a secure and comfortable fit. We were inspired to design these Fi Series 3 adapters when we discovered that standard Fi collars were just too big for our small dog, and Fi collar pouches too bulky. Now our chiweenie (and his similarly sized and big dog friends) rock their Fi trackers in comfort, both day and night. 


This product is designed for the Fi Series 3 tracker only. Please see our other listings for Fi Series 2 compatible adapter clips.

  • We perform extensive testing on our products and inspect every set of Fi compatible clips to ensure reliabilty. If your clips break during normal use, we want to know about it and will set you replacement set of clips to you for free.

    See package insert for details or contact us at

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