776438-3 is an AMPSEAL 16 series 12-way cap connector designed for environmentally sealed electrical connections in industrial and commercial transportation applications. This connector features a C key coding configuration with a black housing and yellow PLR (Positive Lock Retainer), utilizing a standard diameter seal for reliable environmental protection. The contact size is 1.58 mm, and the connector includes an integrated wedge/TPA (Terminal Position Assurance) mechanism. The AMPSEAL 16 series is well-suited for harsh environment applications requiring robust, sealed connections with keyed mating to prevent incorrect assembly.