The Reese Towpower 7-Way to 6-Pin or 4-Way Adapter with LED Circuit Tester easily adapts OEM 7-way blade connector to either 6-pin round or a 4-flat connector. The 6-pole round connector is switchable to meet desired wiring requirements. Instantly checks basic trailer electrical circuits for connectivity and displays the connectivity using high visibility LED's. The hinged dust cover protects the 6-pin round when not towing. REESE is the market leader in automotive and recreational product solutions, engineered and designed to meet the demands for work and active lifestyles. REESE Towpower pioneered the technology that has set the standard for today's most advanced towing systems. We cater to the towing needs of everyone from recreation enthusiasts to heavy-duty agriculture users by manufacturing the largest selection of receiver hitches; ball mounts and hitch balls; trailer and hitch locks; couplers, jacks and winches; and electrical and lighting components that meet and exceed industry standards.