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Need Dewar repairing reconditioning Guide


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Hi Guys, I need a Dewar repairing guide . Attaching pics of the vacuum port.

When I removed the vacuum port ,it sucked on the air hard for 2 seconds. So what I am thinking that there must be another reason for it to go bad. At the same time, I am unable to see any cracks on the surface. Nevertheless I want to re-vacuum and see the performance.

Any input would be of great help.

Thank You




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