PetSafe Fencing Collars Accessory Pack RFA-529 (Set of 2) Repair or Replace your pet's collar Compatible with most PetSafe wireless and in-ground fences Not compatible with: Stay+Play Wireless Fence (PIF00-12917), UltraSmart In-Ground Fence (PIG00-13619), YardMax Rechargeable In-Ground FenceTM (PIG00-11115) and Wireless Mapping Fence (PIF00-13651) Part Numbers: 200-184, RFA-119 Formerly RFA-281 - New SKU is RFA-529