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This Wehrli billet aluminum coolant plug is specified for Duramax engine covers with a 1.1 in (28 mm) bore and is finished in black anodize. It includes a high-temperature silicone O-ring seal and serves as a durable replacement for the original coolant plug. The billet plug provides a direct-fit option for Duramax engine cover applications where a replaceable, service-grade seal is required.
Wehrli Duramax Coolant Plug
