Journeyman-Pro Dryer Adapter Cord 3 to 4 Prong Plug | NEMA 10-30P Male to 14-30R Female | 30A, 250V, 1.5FT, Old Style Wall Outlet (3 Prong Male to 4 Prong Female w/Ground) - Walmart.com
Amazon.com: Clear Power 3 ft 12/3 SJTW, 3 Outlet Extra Heavy Duty Outdoor Extension Cord Adapter, with GFCI,Yellow, Water & Weather Resistant Flame Retardant, 3 Prong Grounded Plug, CP10070 : Tools & Home Improvement