MRCOOL WF-38 3/8 Flare to Weld Adapter is an HVAC connection fitting designed to connect flared copper refrigerant lines to welded piping in compatible air conditioning and heat pump systems. It works by providing a secure, leak-resistant transition between flare and brazed connections, ensuring smooth refrigerant flow and reliable system operation. https://www.partshnc.com/mrcool-line-set-fitting-wf-38