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Description This product is a liquid designed to clean and prevent corrosion of hydronic boilers and heating systems. Product Features: Removes rust and scale, emulsifies oil, grease and sludge Prevents foaming No draining or flushing necessary in moderately dirty boilers Will not harm rubber or plastic components Add to any hydronic system to prevent boiler scale build-up corrosion and clogging of heating system valves Helps maximize boiler efficiency Silicone additive helps purge dissolved air and provides lubrication to pumps, seals and valves Compatible with Hercules cryo-tek anti-freeze, other propylene glycol-based anti-freeze products and commonly used stop-leak compounds NSF registered/USDA authorized Product Type: Cleaner Application: Maintenance Volume: 32 oz. Color: Yellow