Marinco 83A Marine Electrical Shore Power Straight Adapter
(15-Amp 125-Volt Straight Blade Male to 30-Amp 125-Volt Locking Female)
Plug end: 15A, 125V straight blade (NEMA 5-15P); Receptacle end: 30A, 125V locking (NEMA L5-30R). Important: Use ONLY with equipment that draws 15A or less.