blast gate coupling

Dust Management: A duct coupling designed to join a 100mm-65mm PVC reducer to a standard 100mm (4") blast gate.

I use 65mm PVC piping for dust management with my bench-mounted tools (disc sander, band-saw, etc.). The 65mm PVC pipe terminates into a 100mm - 65mm reducer and I needed some way of coupling the reducer to my 100mm blast gate.