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Keep your HVAC and refrigeration systems running smoothly with Nu-Calgon Leak Detector Blue. This innovative solution is designed for easy detection of leaks in even the smallest of lines, making it an essential tool for maintenance professionals. The leak detection blue dye remains in the system until exposed to air or light, allowing you to pinpoint the location of any leaks quickly and easily. Use Leak Detector Blue to save time and money by avoiding costly repairs, extending equipment life, and minimizing downtime. This reliable and easy-to-use product is a must-have for any maintenance professional or DIY enthusiast working with HVAC and refrigeration systems.