Weatherproof an extension cord - Tommy Tape Self-Fusing Silicone
CordSafe Plus Extension Cord Plug Protector Cover Water-Resistant String Christmas Lights Green 1pk - Walmart.com
Twist and Seal Cord Protect - Extension Cord Plug Connection Protector | Keep Cords Together and Moisture Out | Durable Plastic Material | Easy to Use and Weatherproof in the Extension Cord
50 ft Extension Cord with Connector Safety Seal Protector Weatherproof - Rated for Outdoors - EasyLife Tech by FAMATEL