The genuine 4165-24 is a 1 qt. Bottle of Drain Solve that opens condensate pan drains. Drain Solve is non-fuming with no rotten egg odor and is perfect for clogged A/C condensate lines as well as kitchen, bathtub, and lavatory drains. The 4165-24 pours through standing water and cuts through grease and organic matter with no violent eruptions. Drain Solve generates heat when added to water to help loosen clogged drains and is septic safe. , the brand you trust, provides quality chemicals and specialty products for professional use only in the air conditioning, refrigeration and heating markets.