This was a perfect replacement for the low pressure switch on my 2007 GMC Sierra NB "non-classic" so not sure if it works The classic, there is a schrader valve underneath so you can replace it without wasting freon when you change it. No o-ring is supplied "but I didn't expect that" and you will need a new one to replace the one you already have. It bolts straight into its new home and works great. I have a cold again. I only replaced this as I have already replaced the battery it is connected to and redid much of my AC system in the pickup.
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