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Premium Member
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The band clamp starts out at one diameter.....that of the larger pipe, the one that goes over the next pipe.

As you tighten it, it deforms to accommodate the smaller pipe and a 'step' becomes visible.....just like your photo of a different system.
Grade 8 bolts are generally used since you will be using a great deal of force to make the clamp deform.

So, the clamp should be fairly close to the larger pipes diameter, but will seem very loose, till deformed, on the inner pipe.

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