This is a genuine GM OEM Duramax Rear Engine Cover-to-Block Coolant O-Ring Seal.
These o-rings are sandwiched between the rear engine cover and engine block. Sometimes referred to as the rear cover coolant crossover. 2 Are required per engine.
LB7 LLY LBZ LMM, 2001-2010 Duramax
2011-2016 LML Based Engines require GM # 12644448.
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