After overtightening and snapping the head on the first row, I took a closer look and noticed that the shape of the compression was odd within those lines. The semicircular shell inside is an unusual fixture and does not allow for an airtight gap. A second order and a second overrev also broke the head. The details look great and appear to be high quality, but not as good. And without specifying the type of adapter collar, the head is easy to damage. This is AN3, 3/16", but the head is not standard.
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