The MRCOOL WF-38 3/8-inch Flare-to-Weld Fitting is an HVAC connection component designed to join 3/8-inch copper line sets using a flare connection on one side and a weld connection on the other. It provides a secure transition between compatible copper tubing and HVAC equipment, supporting reliable refrigerant flow and reducing installation complexity. The fitting is commonly used wi... https://www.partshnc.com/mrcool-line-set-fitting-wf-38