Aeroquip sells A/C specific hoses for custom routing of A/C lines.
Here's an example:
-6 AN 6ft hose for $67.95
They also sell TFE Racing hose that sells for almost 50% less than the A/C branded hoses:
-6 AN 6ft hose for $35.95
The TFE line can be used with Nitrous so that tells me it will hold a pressurized gas. It also has a much higher pressure rating than the A/C specific hose. The biggest difference besides price is the material. The A/C hose is made from nylon while the TFE hose is Teflon.
Is there a reason why I should pay 50% more for A/C branded hose when it appears the TFE hose will do the same job???