3-Way I.V. Extension Line is a medical device used in intravenous (IV) therapy to extend the reach of an IV line and provide additional access points for administering fluids, medications, or drawing blood. The "3-way" feature refers to a three-way stopcock integrated into the extension line, allowing healthcare providers to control the flow of fluids from multiple directions or sources. This device is commonly used in hospitals, clinics, and emergency settings.