The L21-30 male to L6-30 female adapter is designed to bridge compatibility between different twist-lock power connections in multi-phase and single-phase systems. This adapter allows equipment with an L6-30 plug—commonly used for 250V single-phase loads—to connect to a power source with an L21-30 receptacle, which provides 120/208V three-phase power. Built for durability and safety, the adapter features heavy-duty construction. It is frequently used in temporary power setups, event production, and industrial environments where mixed equipment types require flexible connectivity.