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Trackmaster™ Air-Brake/Signal Hose, which meets AAR specification M601-88, is a low-temperature, flexible hose designed for freight and passenger cars. Coupling hardware is manufactured to AAR Standards 491-1192 (wide-lip configuration) specs. Features include a black neoprene tube and cover, reinforced with multi-spiral plies of high tensile, woven fabric. Gladhand weight is 2.75 pounds each, with ductile iron (ASTM Spec A536, Grade 60-40-18) and gasket face/groove zinc-plated 0.0005 mil. minimum balance protective-coated plating. Male nipple weight is 1.05 pounds each, with ductile iron (ASTM Spec A536, Grade 60-40-18) and protective-coated plating.