To ensure reliability, purchase GM part # 23138955 Cap, Emission Reduction Fluid Tank Filler. It is sometimes referred to as GMC Gas Cap. 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 Sierra, Terrain, Yukon models.
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