The Marinco S20-15 One Piece Adapter 15/20A 125V Straight Blade Female to 20A 125V Locking Male provides flexibility to solve your dockside power center / boat side inlet power incompatibility problems.
Marinco One Piece Adapters are high-quality, one-piece adapters similar in usage to Pigtail Adapters. However, they do not have sealing collars and are not recommended for use in wet locations. Use only in an enclosed, dry location, such as powering your boat from a 15A power receptacle inside your house.