776428-3 is an AMPSEAL 16 connector cap designed for 2-way electrical connections with a C key configuration. The connector features a black housing with a yellow polymer locking ring (PLR) and accommodates 1.58 mm contact size with a standard diameter seal. This cap connector is part of the AMPSEAL 16 series, which provides environmentally sealed connections suitable for industrial and commercial transportation applications. The C key keying system ensures proper mating alignment and prevents incorrect connections, making it ideal for automotive, heavy equipment, and other harsh environment applications where reliable, sealed electrical connections are essential.