Description: The GM Belt Weather-Strip (20921214) is a factory-original door window belt line seal for compatible GM models, covering Tahoe, Yukon, Avalanche, and Sedan variants across Chevrolet and GMC nameplates. Positioned along the top of the door panel at the window opening, it wipes the glass as it moves up and down, preventing wind noise, water entry, and dirt infiltration. A genuine GM OEM seal built to original lip and material specifications.