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You need to use a rigid material that won't collapse under vacuum. Nylon air brake hose is a good, inexpensive choice that comes to mind. Just be careful when routing it around hot parts like the exhaust.
You need to use a rigid material that won't collapse under vacuum. Nylon air brake hose is a good, inexpensive choice that comes to mind. Just be careful when routing it around hot parts like the exhaust.
I am guessing you didn't mean that my copper suggestion was not rigid material
As for the rubber couplings at the end being 1/4" of gap between the copper and metal will not be a problem for collapsing.