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Marinco Power Products 50 amp locking devices are designed for fast and easy assembly, while providing high-quality features that enhance versatility, safety, and durability. Rear housing key fits into the front portion for ease of assembly. A stainless plug sleeve provides greater strength and protection. A non-metallic shell around the plug sleeve eliminates exposed metal parts. Other features include an adjustable cord clamp for superior strain Relief, recessed cord clamp screws for a neat, clean appearance, exclusive Perma perma-lock terminals for secure, easy-to-wire connections, Thick-walled nylon housing that resists abuse, corrosion, and most chemicals, and a Neoprene dust seal to keep contaminants out of the wiring chamber.