A device used to put trunk duct or extended plenum sections together is called a drive clip.

Name: A device used to put trunk duct or extended plenum sections together is called a drive clip.
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A drive clip is a commonly used device for connecting sections of trunk duct or extended plenum. It is designed to be hammered or driven into the metal to hold the two pieces together without the need for screws or other fasteners.

A Device Used to Put Trunk Duct or Extended Plenum