AC WORKS NEMA L14-30P 30A 125/250V 4-Prong Locking Male Plug in Black With UL, C-UL Approval in the Plugs & Connectors department at Lowes.com
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
250 Volt 30 AMP NEMA 15-30 Twist Lock Outlet Receptacle
Locking Outdoor GFI Outlet Cover - 1 Gang Decor
Amazon.com : Baby Safety Outlet Cover BOX [Patent Pending] Double Lock for Much Better Toddler Proofing, Easier Operation, Simple 3 Step Install with Included Screws. Provides Extra Space Inside for Plugs,Adapters :