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Nu-Calgon Rx11-Flush Starter Kit for a Cleaner HVAC System Keeping refrigeration and air conditioning systems free of contaminants is crucial for their performance and longevity. The Nu-Calgon 4300-08 Rx11-Flush Starter Kit provides a complete solution for technicians and knowledgeable DIYers to effectively clean out harmful residues from HVAC systems, especially during repairs or refrigerant conversions. What is Rx11-Flush and What Does It Do? Rx11-Flush is a specially engineered solvent design …