EZ Connectors are waterproof, corrosion-free trailer plugs, designed to ensure a reliable electrical connection for your trailer's lights and brakes. The newest member of the EZ Connector family is the improved, self-closing 7-pin (EZS7) electrical towing connection system. It's now more compact, with a shorter socket to make mounting easier. The EZS7 is compatible with trucks set up for conventional towing, as well as those modified for fifth-wheel trailers. It has been lab tested and certified by the Society of Automotive Engineers. Retail price: $45 for the trailer end; $80 for the truck end.