Trailer your boat in total safety; pin fits through the coupler release handle to prevent it from accidentally disengaging. Fits both 2-inch and 3-inch couplers; zinc-plated steel stands up to tough conditions. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.