At 15 psi max for dispensing, you really don't need ss braided lines...waste of money and you'll never see those gleaming beauties like you would under the hood of a car.
DO NOT use the spray foam...if you have any issues (and you will some day) you will NEVER be able to get back into the tower to change the lines, faucets, etc.
Spray foam in a tower = bad news!
My $0.02.
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