To ensure reliability, purchase GM part # 22048578 Valve,Vacuum Pump Check. It is sometimes referred to as GM Air Inject Check Valve, GM Diverter Valve, GM 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 Century, Electra, Regal models. It fits Oldsmobile 98, Cutlass.
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