The 0413-216-2005 is a keying pin, size 20, designed to prevent mis-mating of electrical connectors by occupying empty cavities within connector housings. This solid plastic rod is a connector accessory used in DEUTSCH connector systems to ensure proper alignment and prevent incorrect connector pairing during assembly and field operations. The keying pin is compatible with size 20 connector cavities and is commonly used in automotive, industrial, and transportation applications where connector reliability and safety are critical. By blocking unused cavities, it reduces the risk of accidental misconnection and improves overall system integrity.