What this plug housing does on the harness
The 1-967584-3 is a 4-position, 2-row sealed plug housing from TE's Micro Quadlok series. The sealed feature means the connector keeps contaminants out of the terminal cavity, which is the main reason to choose Micro Quadlok over an unsealed alternative in the same pitch class.
This plug housing accepts male pin contacts (crimp termination) that are sold separately. The free-hanging mount allows it to mate with a corresponding sealed receptacle on the wire harness or directly to a header on the PCB. The 2-row, 4-position layout matches the standard Micro Quadlok footprint — confirm the mating half part number before committing.