The D38999/20WC35PN is a circular connector that functions as a wall-mount receptacle, compliant with MIL-DTL-38999 Series III specifications. It features a size 13 aluminum shell with a Class W olive drab cadmium finish, ensuring 500 hours of salt spray resistance and an operating temperature of 175°C. The connector is configured with a 13-35 insert arrangement, housing 22 size 22D pin contacts rated for a 5A test current. It has a service rating of 'M', with a suggested operating voltage of 400V AC (RMS) at sea level and provides EMI shielding of at least -50 dB at 10 GHz. This robust connector is designed for high-reliability applications in military and aerospace environments.