3 Phase Plug, 4 Pin Power Plug 3 Phase Waterproof Concealed Mount Socket Connector Set 380V‑415V 16A 3P+E Electrical Connector - - Amazon.com
Four-Pin Electrical Connector | West Marine
Amazon.com: SP21 4 pin Waterproof Heavy Connector, 2Screw Panel Fix Socket LED Power Cable Plug High Voltage Bulkhead Heavy Connector(4pin) : Tools & Home Improvement