To ensure reliability, purchase GM part # 12579977 Seal,Coolant Outlet(O Ring). 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 Buick Rainier models. It fits Chevrolet Colorado, Trailblazer. It also fits GMC Canyon, Envoy. This also fits Hummer H3, H3T.
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