Very good quality. The valve works and is also of good quality. The body is machined, the thread is clean. This summer I had no problem using this item on several car air conditioners. I would recommend it to anyone who needs a way to put oil in the air conditioner. On one car, when I didn't have gauges with me, I just used a can of 134a to force oil into the system. That's how it worked great.
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