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Jacket is a blend of Nitrile Rubber and PVC which offers more desirable properties than either Rubber or PVC alone. 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 14-30 female receptacle.