need help connecting 5" cool tube to 4" ducting

pheed

Active Member
I have a compact 5" diameter cool tube which I need to connect to 4" ducting. The only 5" to 4" reducers I can find are these, but don't I need ones that are crimped on the 5" end? Or do they just slide onto the cooltube with a tight fit?

I'd really like to avoid having to use duct tape near the cool tube...
 
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