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25-120911HD

HD BELT

This is a heavy-duty serpentine belt for Class 8 trucks and other large diesel applications. It drives multiple engine accessories such as the alternator, fan, and A/C compressor. You replace it when you see cracking, glazing, or fraying, or as part of scheduled maintenance to avoid a sudden breakdown on the road. It uses EPDM rubber with polyester cords for long life and resistance to heat and wear under extreme engine‑bay conditions.