Keep your 2015-2021 GM 6.6L Duramax with single alternator running strong with the Dayco Poly Rib HD Serpentine Belt.

Built with a rugged EPDM rubber compound reinforced with aramid fibers, this belt delivers excellent durability, heat resistance, and long life. The poly-rib design ensures a secure grip and smooth performance across all your engine’s accessories while minimizing noise.

Designed to maintain proper tension and resist wear, it's a reliable, heavy duty replacement that’s ready to handle the demands of your diesel rig.