To ensure reliability, purchase GM part # 12556070 Valve Assembly, Secondary Air Injection Check. It is sometimes referred to as GMC Air Inject Check Valve, GMC Diverter Valve, GMC 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 GMC Sierra, Yukon models.
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