1333715 Ring-Backup Fits Caterpillar ModelsOne New Aftermarket Replacement Ring Backup for Caterpillar (Cat) Engines and Equipment This aftermarket replacement backup ring (Cat part number 133 3715 1333715) is used in the fuel injector assembly on Caterpillar 3126, C7, and related engines. The backup ring seats alongside O ring seals on the electronic unit injector (EUI), providing a critical pressure seal that prevents high pressure oil and fuel leakage in the injector bore. Proper
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