To ensure reliability, purchase GM part # 94011603 Seal,Thermostat Bypass Pipe (O Ring). It is sometimes referred to as GMC Thermostat Gasket. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific GMC Savana, Sierra, Yukon models.
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