Hubbell - HBLMITLHeavy Duty Products, Switched Twist Lock, Industrial Grade, Accessories, Mechanical Interlock, 30A 600V AC, Single Conductor, Terminal Screws, Gray Unfused Mechanical Interlock for Watertight Safety Shroud Virtually Eliminates Possible Circuit Making or Breaking While Under Load Compact, Corrosion Resistant Type 4X Non metallic Enclosure Molded Valox Resists Abuse, Corrosion and Enhances Safety Authorized Hubbell Distributor **Beware of buying