The Trane DHY1123 Catch-All Sealed Filter Drier C-304 is a refrigeration system component designed to remove moisture, acids, and contaminants from circulating refrigerant. Its internal desiccant core absorbs moisture and harmful acids, while the filtration media captures dirt, metal particles, and other debris. Used in compatible HVAC systems, including air conditioners, heat pumps, ... https://www.partshnc.com/dhy1123-trane-catch-all-filter-c-304-sealed