BE-500 Ultra-Wire Boundary Extension KitNeed more wire? Our BE-500ULTRA Kit gives you 500 feet of our special Ultra-Wire, 50 Brightly Colored Flags and 2 improved, waterproof wire connectors. This wire was specially designed and manufactured for one and only one purpose, electronic dog fence boundary wire. It has electrical and mechanical properties optimized for your dog containment application exceeding even 18 gauge wire performance. The wire is solid core copper designed for optimum electrical impediance. It has an extra thick jacket made of a specially formulated insulation material that is especially resistant to Ultraviolet sunlight, moisture, rot and corrosion. It's 40% thicker overall and about three times stronger than standard 18 gauge wire, greatly reducing the risk of wire breaks. COMPARE OUR NEW ULTRA-WIRE TO THE OTHER GUYS' WIRE500 Feet of Our Competitors'         500 Feet of Thicker           500 Feet of Ultra-Wire           20 Gauge Wire                         18 Gauge Wire                               ![]() Look at Ultra-wire compared to standard 20-gauge and 18-gauge wire. Each spool holds the same 500-foot length of wire. The fact that the Ultra-wire spool is so much bigger illustrates how much thicker Ultra-wire is in overall diameter. That translates to higher strength, longer life and less chance of wire breaks! Take a look at the chart below to determine how many kits you need.
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