So far so Good
28-11401 - 4" Worm Screw Clamp for Dryer Vent Hose
Adjustable from 3-9/16" to 4-1/2" diameter
Two each required for aluminum dryer vent duct (MCM part number 28-11400)
I have been dealing with MCM for over 30 years now. If I didn't like the service I'd would have found a different supplier 30 years ago. For most of my needs they are the 1st stop on my shopping list.