LOCKNDRY Power Supply Extension Cord - 16 gauge, 50 ft long. The revolutionary LOCKNDRY is the only detachable power supply cord approved by Underwriters Laboratories for use only with Allied Precision heated buckets, heated pet bowls, heated bird baths, deicers, etc. 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 the LOCKNDRY compatible power cord, the large black nut pulls the plug tight against the gasket to form a water-resistant seal. The red nut the locks everything in place and prevents cord separation. The LOCKNDRY is great as an all-purpose extension cord too! Made in the USA!