To ensure reliability, purchase GM part # 6551640 Valve Cap, Accumulator Dehydrator, 7/16X20 Thread. It is sometimes referred to as Buick 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 Buick Century, Lesabre, Regal models.
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