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HBD/Thermoid says its Trackmaster™ air brake/signal hose meets AAR specification M601-88, and is a low-temperature, flexible hose designed for freight and passenger cars. All couplings hardware is manufactured for HBD to AAR Standards 491-1192 (wide-lip configuration) specs. Features include a black neoprene tube and cover, reinforced with multiple plies of high tensile, woven fabric. Gladhands weigh 2.75 pounds each, with ductile iron (ASTM Spec A536, Grade 60-40-18) and gasket face and groove zinc-plated .0005 mil minimum balance protective coated plating. Male nipples weigh 1.05 pounds each, with ductile iron (ASTM Spec A536, Grade 60-40-18) and protective-coated plating.