These coolant system air bleed plugs are designed for LS-series V8 engines (4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L) from 1997 to 2003. Constructed from heavy-duty steel, they provide a durable and effective solution for bleeding air pockets from your cooling system. By releasing trapped air, these plugs help improve coolant circulation, maintain consistent operating temperatures, and prevent overheating issues that can damage critical engine components. Each plug is manufactured to OEM type replacement (replaces part number 12602540) for a precise fit and direct replacement. For the most effective results, it is recommended to install one/two plugs per engine to ensure complete air bleeding during coolant system maintenance or rebuilds. Built for performance and reliability, these plugs are an essential component for maintaining your engine's cooling efficiency in both automotive and marine LS V8 applications. Engine Quest produces high-quality OE-style replacement parts. Each part undergoes rigorous testing and inspections to meet EngineQuest's exact specifications. Designed for precision manufacturing and durability, our products ensure easy installation. With nearly 500 SKUs available, the company specializes in hard-to-find, in-demand parts, including those no longer available from the OEM, difficult to salvage, or with prohibitively high OEM costs.