The WCFab Duramax Coolant Plug is a simple and effective solution for sealing unused coolant ports on your Duramax diesel engine. Precision CNC-machined from billet aluminum and finished with a durable black anodized coating, this plug provides a clean, leak-free seal while adding a professional look to your engine bay.

Designed for Duramax engine covers with a 1.1-inch bore, this plug installs easily and includes a high-temperature silicone O-ring to ensure a reliable seal under extreme engine heat and pressure. Whether you're completing a custom engine build, cleaning up unused ports, or finishing an engine swap project, this coolant plug offers a durable and professional solution.

Durable Cooling System Solution

The Duramax cooling system can require port block-offs when performing engine modifications, aftermarket turbo installations, or custom fabrication work. The WCFab coolant plug is engineered to handle the demanding environment of a diesel engine bay while maintaining a reliable seal against coolant leaks.

Its billet aluminum construction provides superior durability compared to plastic plugs, while the anodized coating helps prevent corrosion and wear over time.