6.6L Duramax Billet Coolant Block Off Plate (2001-2025) CP4 Its base includes a built-in

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6.6L Duramax Billet Coolant Block Off Plate (2001-2025) CP4 Its base includes a built-inUpgrade your rear engine cover and stop the coolant leaks for good! The fleece performance blocking plate is thicker than the stock plate and has an integral square cut O ring with no gasket required. OE covers are prone to leakage over time, our billet coolant block off plate with an integral O ring is an upgrade for your rear engine cover and will the stop the coolant leaks for good. Direct Replacement for GM P N: 97941204 and 12698239