  
Homeowners who need additional wire for yards up to 3 acres only need to purchase boundary kits. Each kit includes 500 feet of 20 gauge boundary wire, waterproof wire splices, instructional video, and training flags to help your dog learn the boundaries. In addition to your containment system kit wire, you'll need to add 1 extra boundary kit to extend your fence to 1 acre, and you'll need 2 extra boundary kits extend your fence to 3 acres. Same as BD-25 and CK9-25 boundary kits. Photo on box may differ from above. Used with the following systems: HF-25W, HF-200W, CT-400A, CB-100W, CKC-25W, CKF-200w, SD-2100 and many others.
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