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Today'secret is about the quality of the glass. We would In order to check the joint we can simply put some ethanol onto these walls, onto the joint, take the vapor duct onto the other side, put it in and then we can easily see if it's tight or not tight. T In contradiction to the sample we've seen before I would I do exactly the same. I use the same vapor duct. I push it in and there is absolutely no bubbles. You can't move it to anyt Another quality property of the glass where we have is that the flask is very round. That means it doesn't wobble. You can see now it's exactly precise and if we compare it to other flasks there is a big difference. The impact of t As you can see with that's very different to the flask we've seen just before. Now we have a different stock cock and we can see that even with t When I move it up air can leak through t Now we are applying vacu So now you understand how complex it is to manufacture such an item such as a vapor duct and how difficult it is to control all these quality aspects of one of these pieces. If you want to know more information please contact your specialist.