Marinco Surge Protection Pigtail Adapter. 30A 125 V female to 30A 125 V male. Designed to detect and protect from unsafe electrical conditions such as open ground, open neutral, and reverse polarity. Can also be used to protect marine electronics from power surges. Ergonomic 90? dockside plug. Features locking sealing collar system, 3-color LED electrical status indicators, and surge failure indicator.