To ensure reliability, purchase GM part # 12550930 Valve Assembly, Pulsed Secondary Air Injection Engine Shutof. 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 C2500, C3500, Suburban models.
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