Ben, what are you building??? If it's pressure related, PVC might be a better option as no ally is not used in pressure applications particularly for liquids.
If it's a non pressure app, try PG Body Builders as they supply & fit 6 & 7 inch ally tube for our intake stacks for Freightliners & Benz trucks.
Cheers
Andrew




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) is ally and the gauge at max is 300kg / cm. 

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