MRCOOL WF-34 3/4 Flare-to-Weld Connection Adapter is a refrigerant piping accessory designed to connect a 3/4-inch flared fitting to a compatible weld connection in HVAC systems. It works by creating a secure transition between different connection types, allowing refrigerant lines to be joined properly while maintaining a reliable sealed pathway. Designed for use with compatible MRCO... https://www.partshnc.com/mrcoolr-line-set-fitting-wf-34