3 to 4 inch vent Duct Coupler Customizable

thingiverse

I needed a coupler from 4 inch to 3 inch vent duct. My duct was ripped and in the attic with cellulose insulation making it difficult to replace and even harder to use a standard coupler. I designed it with tapered ends to make it easier to insert in the damaged duct. Here is the design that was the inspiration for this model. https://www.thingiverse.com/thing:2664434