FGG.0B Quick Connect 4 Pin Plug - 9mm Outer Diameter : ID 5318 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
XH2.54 Connector JST XH 2.54mm Pitch 4 Pin Plug Male & Female Jack Terminal
JST 2.5mm XH 4-Pin Male Female Connector Plug with 30cm wire x 10 Sets | eBay
1 Kit 4 Pin Way Electrical Wire Connector Plug Set auto connectors with cable/total length 21CM - AliExpress
Amazon.com: Laisomeke 4 Pin electrical Connector Waterproof Connector,Male and Female Way 16 AWG Wire Suitable for car Truck, Boat and Other Wire Connection (5 pack) Black : Automotive
4-Pole Round Trailer Connector
GTE 1253-5826 Connector Plug 4-pin - Global Test Equipment