776523-4 is an AMPSEAL 16 3-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 D key keying (green PLR color-coded), black housing, and reduced diameter seal configuration to ensure reliable sealing in harsh environments. It includes integrated wedge/TPA (Tertiary Positive Assurance) locking mechanisms for secure contact retention. This connector is commonly used in automotive, heavy-duty equipment, and industrial control systems where environmental protection and reliable mating are essential requirements.