ENERLITES NEMA 5-15P Straight Blade Replacement Plug Connector, Male Extension Cord Ends, 15A, 125 Volt, 2 Pole, 3 Wire Grounding, Heavy Duty, UL Listed, Black - Walmart.com
Eaton - Cooper Wiring AH5969Y Quick Grip Straight Blade Connector, #18 AWG to #12 AWG, 15A, 125V, Back Wire, 2-Pole, 3-Wire, Yellow - City Electric Supply
Hopkins Towing Solutions Multi-Tow 4 Flat to 7 Blade and 4 Flat Adapter, 47185 - Walmart.com