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Product Description 9", 12/3 STW, locking cord Adapter, yellow, converts 15a-125v straight cap to 20a-125v, standard 15a U- ground plug, (NEMA 5-15P), twist to lock 20a receptacle (NEMA l5-20r), twist-to-lock adapters designed for use in construction & industrial applications where extra protection & durability are needed, constructed with heavy-duty 12 gauge wire & molded locking male & female connectors. This product is manufactured in china. From the Manufacturer This 9" 12-gauge 3-conductor 125-volt, adapter will convert a standard 15-amp grounded receptacle to a twist-to-lock 20-amp receptacle.