MANUFACTURING & DISTRIBUTING THE INDUSTRY'S LARGEST SELECTION OF GLADHANDS Tramec Sloan designs & manufactures gladhands in the USA at our facilities in Holland, Michigan and Iola, Kansas. We provide wide variety of feature combinations to meet your specific needs, including numerous body styles, materials, coatings, seal types and more! Our gladhands meet DOT and SAE Specs every time. With the wide variety of options that Tramec Sloan offers you can build your gladhand to meet and exceed performance in the most rigorous of environments. From under the hood, to the back of the trailer...We've got you covered!