Sinister Diesel Coolant Block Off Plate 14-24 GM 6.6L Duramax. Fits: 2011 - 2016 Chevy/GMC 6.6L LML Duramax; 2017 - 2019 Chevy/GMC 6.6L L5P Duramax; 2020 - 2025 Chevy/GMC 6.6L L5P Duramax.
