To ensure reliability, purchase GM part # 20911239 Cap,A/C Refrigerant Service Valve. It is sometimes referred to as GMC A/C Service Cap. 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 Savana, Sierra, Yukon models.
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