The revolutionary Allied Precision Industries LockNDry Outdoor/Indoor Detachable Power Supply Cord provides a water-resistant seal, while keeping the connection firmly secured. The specially designed plug on the LockNDry cord fits any standard outlet, but when mated with a LockNDry compatible power cord, the large black nut pulls the plug tight against the gasket, to form a water-resistant seal. The red nut then locks everything in place and prevents cord separation. And, the LockNDry is great as an all-purpose extension cord, too.