Metal M8 Self-Locking 4pin Male and Female IP67/IP68 Waterproof Solar Connector - China Mc4 Connector, Solar Panel | Made-in-China.com
Amazon.com: Eonvic SP21 Aviation Connector 4Pin Panel Mount Aviation Plug Socket Waterproof IP68 Connectors with Cap Panel Mount for Industrial Device Power Signal (1PCS-SP21 4pin) : Electronics