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Title: It's okay.
Review: Like other reviewers said, this item is not as pictured. It DOES NOT have a large rotary knob, just a little bar for a knob. It works like it's supposed to work and you need one if you plan to use 12oz cans of R134A refrigerant with your manifold gauges. If I had it to do over again, I'd probably purchase the version with the rotary knob. Just my opinion.
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