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Machinery Parts Trading Excavator Couplings Replacement suitable for Caterpillar® equipment and many other heavy equipment industries. Our Excavator Coupling (Hydraulic System) assemblies are manufactured with the highest quality thermoplastic polyester as well as high temperature rubber (HTR), that are highly resistant to extreme temperatures, chemicals and solvents. Both materials have excellent properties for transferring and absorbing shock load and reducing wear on equipment. At Machinery Parts Trading you are guaranteed to get high quality excavator couplings at competitive prices with superior quality.