Insulated Copper Coil for Air-Conditioner And Refrigeration. 1. Insulated Copper Coil for Air-Conditioner, Refrigeration.2. Outside diameter: 1/4"-7/8"3. Length: 3m, 5m, 15m, 20m.4. Standard: ASTM B280,JIS H3300, EN12735,AS1571.5. Package: Carton Box.