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Kaj
2025-08-31 12:39:34
I have a background in chemistry, and I am impressed with what I received for what I paid. The stopcock appears manufactured with tight tolerance: no detectable leakage, at least with an initial test using isoproyl alcohol. Comes in a double-layered cardboard box with form-fitting styrofoam (do not throw this away—you will want it for storage & transport). My one complaint is that the stopcock's tolerance is so tight that I was anxious about breaking the piece while initially trying to loosen it up. However, once you've gotten it to turn for the first time, the action is smooth & doesn't demand too much force. I will likely come back to this exact listing in the future for larger-volume sep funnels as projects demand them.
John Brandt
2025-01-25 21:56:10
When I first bought this the stopcock was very hard to move even after loosening the screw on the other side. I was worried to use force as I did not want to break it. Do not be alarmed after loosening the security screw on the other side of the o-ring, just carefully but with force keep trying to turn the stopcock and itll eventually budge. I poured IPA into it and saw it did not leak so on first glance it works great!
Terry Radcliffe
2024-12-26 15:43:24
They're fragile, but that is expected with most lower end lab equipment. My roommate broke this one, but I never did by using it properly. Great for the price.
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