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Machinery Parts Trading U-Cup Cylinder Seals Replacement suitable for Caterpillar® equipment and many other heavy equipment industries. The U-Cup seals are made of Polyurethane, which ensures they have the exact flexibility for a greater efficiency and easy installation. Because of their design and composition, Our hydraulic seals offer a better friction and adapt better to high temperatures, prolonging the life of the seal. At the same time they also offer a better sealant resistance to high pressures avoiding leaks and pollution. Some of the characteristics of our U-Cup Seals are: - Polyurethane compounds - Hardness, durometer: 90 Shore A - Tensile Strength: 55 Mpa - Ultimate Elongation 550% - Temperature Intermittent: -22°F / 150°F. At Machinery Parts Trading you are guaranteed to get high quality U-Cup cylinder seals at competitive prices with superior quality.