The Merchant Automotive 10089 Billet Coolant Block-Off Plate eliminates the common leaking issue in your 2001-2017 GM 6.6L Duramax. The factory coolant block-off plate has a cast design with a gasket. Over time, this plate commonly begins to leak. Merchant Automotive has designed this billet block-off plate with a built-in o-ring seal for a leak-free installation.
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