A Twist-Lock Receptacle L5-15R is a type of electrical outlet that is designed to lock into a Twist-Lock plug.
They are typically made of durable materials, such as nylon or metal, and they are often weatherproof. They are also color-coded to indicate their voltage and amperage rating.
To connect a Twist-Lock plug to a Twist-Lock receptacle, simply insert the plug into the receptacle and twist it clockwise until it locks into place. To disconnect the plug, twist it counterclockwise and remove it from the receptacle.