The Sporlan Controls 401307 Liquid Line Filter Drier is a high-performance refrigeration system component designed to protect HVAC equipment from moisture, acids, and solid contaminants. Installed in the liquid line, it uses a desiccant core to absorb moisture and filter debris before refrigerant reaches critical components. https://www.partshnc.com/c304s-12odf-liq-line-drier