Description: All models. Silverado, sierra. 4.8l, 5.3l, 6.0l, 6.2l. Yukon XL, Suburban. 5.3l. Tahoe, Yukon, Escalade. 6.2l. Tahoe, Yukon, Escalade. 5.3l. Eng. code o (flex fuel). Avalanche. 5.3l. Yukon XL, Suburban. 6.2l. Escalade EXT. Helps provide a seal to prevent fuel leaks Helps seal combustion chamber from the elements This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors