Amazon.com: Nilight 4Pin Way Electrical Wire Connector 10 Pack 16AWG Male Female Plug Socket Quick Disconnect Waterproof Plug Play 1.5mm Series Terminal for Car Truck Motorcycle Marine Boat, 2 Years Warranty :
Reese Insta-Plug Kit 4 Wire Flat in the Trailer Parts & Accessories department at Lowes.com
Snap-action 5-Wire Block Connector (12-24 AWG) - Pack of 3 : ID 874 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
60 in. 4-Way Flat Connector - TowSmart
TowSmart 12 in., 4-Way Flat Trailer Wiring Connector 1441 - The Home Depot
Amazon.com: NAOEVO 4 Pin Connector Waterproof, 16 AWG 4 Wire Connectors, Automotive Electrical Connectors Male and Female Way With Heat Shrink Tubing for Car Truck Boat Wire Connection, 6 Kits : Automotive
Automotive Pigtails / Sockets
Wire Connector Wiring in Safer & Easier Way | GKEEMARS
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
Hopkins 4-Wire Flat Connector, Vehicle to Trailer Wiring Connector in the Trailer Parts & Accessories department at Lowes.com
4 Terminal Electrical Wiring Harness Electrical Connector for Vintage Honda Motorcycles| Common Motor Collective