The MRCOOL WF-34 Flare-to-Weld Fitting for Air Handler Connections is an HVAC connection accessory designed to provide a secure transition between flared and welded refrigerant line connections. It works by creating a reliable, leak-resistant connection that allows proper refrigerant flow between compatible air handlers and refrigerant piping. Commonly used with MRCOOL air handlers, s... https://www.partshnc.com/mrcoolr-line-set-fitting-wf-34