776487-3 is an AMPSEAL 16 4-way plug connector designed for environmentally sealed electrical connections in industrial and commercial transportation applications. The connector features a 1.58 mm contact size with C key keying configuration and yellow polycarbonate locking ring (PLR) for positive mating identification and prevention of incorrect connections. It incorporates a standard diameter seal for environmental protection and includes integrated wedge/TPA (Tertiary Positive Assurance) locking mechanisms. This connector is commonly used in automotive, heavy-duty truck, and industrial equipment applications where reliable, sealed electrical connections are required in harsh environments.