4 inch (4") Dust Collector coupler Dust collection fitting
thingiverse
Coupler for 4" dust collection piping. I use this piping for dust collection: https://www.homedepot.com/p/Advanced-Drainage-Systems-4-in-x-10-ft-Triplewall-Pipe-Solid-4550010/100135310 No need to glue; just duct tape in place.
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