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 RV from a 15A power receptacle inside your house. Not recommended for use in wet locations | Marinco One-Piece Adapter with 15A 125V Straight Blade Male Plug and 30A 125V Locking Female Connector