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Stepdown Fitting #dustcollection


 

My hose is 120 mmn? OD=4.72" almost 4 3/4"
The dust collector is 4" OD

Who has a setp down fitting of this size either rigid or flexible instructure?
Is there a flex one than can be used with hose clamps to tighten the hose to the collector?
How do you predetermine a hose clamp size? Is there a rule of thumb/
Thanks

Seems simple, but haven't found one yet.

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