D38999/33Z25R is a receptacle dust cap designed for MIL-DTL-38999 Series III connectors, offering environmental protection and contamination sealing at the connector interface when unmated. The cap features aluminum alloy construction with black zinc nickel plating finish, providing 500 hours of salt spray corrosion resistance and conductive electrical properties. It operates reliably across a temperature range of -65°C to +175°C and is RoHS compliant. The accessory shell size 25 accommodates larger connector configurations, with dimensional specifications including an outer diameter of 41.14 mm (1.62 inches) and a standard length of 127.00 mm (5.00 inches). This dust cap is commonly used in aerospace and harsh environment applications where protection of unmated connectors from moisture, dust, and other contaminants is essential during storage or non-operational periods.