The Mueller Industries A19084 Transducer Valve NPTFI x NPTFE is a brass refrigeration valve designed to provide a secure connection point for pressure transducers and monitoring equipment in HVAC and refrigeration systems. It works by allowing pressure access from the refrigerant circuit through its threaded female and male NPT connections, supporting pressure measurement and system s... https://www.partshnc.com/a19084-mueller-industries-nptfi-x-nptfe-transducer-valve