DE-59-20 is a protective dust cap designed for Cinch D-subminiature connectors with E shell size and 9-pin standard density configuration. The cap is manufactured from black polyethylene and is specifically engineered to protect connector contacts when the connector is not mated. Key dimensional specifications include an outer diameter (A) of 0.694 inches (17.63 mm), a mid-section diameter (B) of 0.627 inches (15.93 mm), a depth (C) of 0.362 inches (9.19 mm), and an inner diameter (D) of 0.295 inches (7.49 mm). This dust cap is essential for maintaining connector integrity and preventing contamination during storage or transport, making it ideal for industrial, telecommunications, and military applications where connector reliability is critical.