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
Cord Connect Watertight Cord Lock - OSHA Orange
Woods® Push-Lock Extension Cords w/ Black Plug – Woods Home Products
100FT UltraXtreme Extension Cord WB12100UX-LOCK
Pro Lock 12/3 SJTW Lighted Extension Cord with CGM, Orange - 50 ft.