14/3 Locking Extension Cord - 15A - 50'. Marinco 15A extension cords feature marine-grade 14/3 SJTOW cable and a universal slide button lock on the female end for protection against cable disconnection. The lighted female end provides visual power indication.. Features:. Clear ends with lighted female end for visual power indication. 14/3 marine grade SJTOW cable. Female end contains slide button lock for protection against cable disconnection. Slide button lock compatible with all other manufacturers' products. ETL certified to UL standards. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.