A connector including an insulating base, two electrode rods, and two L-shaped electrode sheets is provided. The security gateway also receives attributes of the rejected messages that triggered the rules. The system also may include a catheter having a balloon at its distal end. The tip portion of the hook is tapered to facilitate insertion behind a previously installed plank of siding. Battery power is conserved through various methods. The disclosed embodiments provide a refrigerant-based ice storage system with increased reliability, lower cost components, and reduced power consumption compared to non-isolated systems.