USW 12/3 Twist to Lock Multi Outlet Adapter 3-ft 12 / 3-Prong Indoor/Outdoor Sjtw Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com
Amazon.com : API Extension Cord Lock ClickShield Cord Lock (Black) (Item No. 28CSK) : Pet Feeding And Watering Supplies : Tools & Home Improvement
Pro Lock Locking Extension Cord Connector, Blue | EquipSupply