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Evans Prep Fluid, EC42001, is a waterless cooling system flush engineered specifically to purge the cooling system of water and water-based antifreeze after draining and before installing new Evans Waterless Coolant. Prep Fluid should be used when block drains are unavailable or cannot be removed. It is not a substitute for thoroughly draining the cooling system and related components. Prep Fluid is not intended to be a stand-alone operating coolant, but as a flush only. Evans Prep contains a bittering agent/bitterant.