The MS3112E20-41P is a box mounting receptacle connector designed for environmental-resistant applications per MIL-C-26482 Series 1 specifications. This connector features a shell size 20 with solder contacts and an open wire seal (Class "E") termination assembly, providing moisture-proof sealing for individual wires. The receptacle accommodates bayonet coupling with a threaded connection and is constructed with olive drab cadmium plating for corrosion resistance. It is suitable for aerospace, military, and industrial applications requiring reliable sealed connections in harsh environments, offering design flexibility through multiple insert arrangements and contact configurations.