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Twist-Lock was invented by Hubbell and is a patented term. Locking plugs have the pins arrayed in a circular manner. The plug is inserted and twisted to lock in place. Assembly is made with Hubbell brand connector.
Adapt a NEMA L6-30 Male Plug (30 Amp 250 Volt twist lock) to fit into a L14-30 female receptacle.
Make sure the equipment will operate at the supplied voltage to avoid damage.