To ensure reliability, purchase GM part # 12639108 Check Valve. It is sometimes referred to as Buick Air Inject Check Valve, Buick Diverter Valve, Buick Secondary Air Injection Check Valve. 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 Allure, LaCrosse, Regal models.
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