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I would recomend 4mm I used 3 and it was a bit restrictive. Probably need 2-3 meters

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I've used
3mm tighter fit I can't see how it can be restricting as is vacuum ? Unless it's cheap hose and it's collapsing under load
8mm for n75 again tighter fit
Buy decent silicone not the usual eBay crud ! Be willing to pay more than 99p a metre !