White Electric | Standard Series, Plug Top, Flexible, 4 PIN, 10A, 500V
Amazon.com: CNLINKO 4 Pin Power Industrial Circular Connector, Male Plug & Female Panel Mount Receptacles Socket Jack, Outdoor Waterproof IP67, AC DC : Electronics
FGG.0B Quick Connect 4 Pin Panel Mount Socket - 9mm : ID 5319 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Four-Pin Electrical Connector | West Marine
HangTon HE21 4 Pin 30Amp Waterproof Wire Connector Male Female Plug Socket for Outdoor Marine LED/Power/Lighting Equipment: Amazon.com: Tools & Home Improvement