3-PIN CONNECTOR W/HEADER, 0.1" | All Electronics Corp.
3-Pin Wire Joints (3 Pack) : ID 5098 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: YETOR Way Car Waterproof Electrical Connector,16 AWG 3 pin Plug Auto Electrical Wire Connectors Marine for Car, Truck, Boat, and Other Wire Connections.(5 Pack)¡ : Automotive
SY1710/SY1711, 3 pin Waterproof power connector, 3 pin wire connector plug socket, IP68, Panel mount plug socket power charger|connector plug|connector waterproofsocket connector - AliExpress
JST PH 2mm 3-pin Plug-Plug Cable - 100mm long : ID 4336 : $0.75 : Adafruit Industries, Unique & fun DIY electronics and kits
HangTon HE21 3 Pin Outdoor Waterproof Connector Electrical Circular Threaded Male Cable Plug Female Panel Mount Socket for LED/Power/Lighting Equipment: Amazon.com: Industrial & Scientific