The TE Connectivity 2-1703639-1 is a 12-position, 2-row receptacle housing from the Heavy Duty Sealed Connector Series, also known as MCP 1.5K. It's a free-hanging (in-line) housing with a 4.00 mm pitch and 6.00 mm row spacing, designed to accept female socket crimp terminals. This is the connector half that stays on the wire harness, mating with the matching header.
The 4.00 mm pitch gives enough spacing for 1.5K (1.5 mm²) wire with the MCP contact system, which is common in automotive and industrial power circuits. The sealed housing keeps moisture and debris out of the connection — suited for underhood, engine bay, or washdown environments. The wide -40°C to 140°C temperature range covers both cold starts and hot engine compartments without derating the housing material.