Aluminum AC Hard Lines

[tonyvol]

I'm trying to go from the number #10 fitting to the bulk head. I can't get a hose and fittings to work because it is kinking even though I'm using reduced diameter AC rubber lines. Do see any reason not to use a hard line? Will the low pressure side #10 hard line sweat? Do I need to be concerned about vibrations causing a leak since I'm going from the VA unit to the bulk head? Also, does anyone have a good idea on sealing the bulk head so that I doesn't leak? Not sure if 3M Strip caulk or silicone caulk will be fine.


Thinking about using this hard line.
http://www.oldairproducts.com/catalo...be-p-5282.html



Here are some pictures of my install.