The leading cause of trailer failure is corrosion of the frame, brake, or springs. Now with Trailer Spa, you can easily and effectively rinse your trailer regularly just by connecting a garden hose, helping to extend the life of your trailer. This kit contains everything needed to install a custom washdown system on trailers up to 3 axles in size. Spray heads can be positioned to rinse specific areas of the trailer or underside of the boat or lower units. Includes 32 fl. oz. of Salt Off concentrate with PTEF to remove salt deposits and protect metal surfaces.