T6 large frame turbo drain flanges
A NPT fitting threads into that, and then the 12AN hose screws onto the NPT fitting. It's come loose on me recently and since the S475 is such a large turbo getting up in there to tighten it is a hassle.
I'm thinking something like this might be less prone to backing off..
https://i.ebayimg.com/images/i/20237...-1/s-l1000.jpg






