Repa Market 8" to 4" Inch Duct Reducer/Increaser – Galvanized Steel Vent Pipe Adapter HVAC & Dryer Vent Systems – Round Metal Coupling Connector for Exhaust Fans, Bathroom Ventilation, Kitchen Hoods

Great if you want to lose some inches. Size matters here

So often dust collector fittings are too loose, or too tight, or too thin, or too whatever. In this case, the 6 to 5 adapter was perfect-- allowing me to connect my 6" DustDeputy port to a 5" hose without leaks. Furthermore, it is a seamless made from heavy guage metal so no bending or distorting. Well worth the extra couple of extra dollars compared to standard sheet metal fittings.

I use this fitting for part of my dust collector with aluminum tape. It works great. it doesn’t fit on the dust collector but with the tape it’s a pretty solid connection.

Was looking for a 12 in reducer for hvac. And this was about all I have been able to find to date. It is nice but heavy for the use I needed so will possibly have to add some extra support for it.

This thing is decently constructed, easy to work with and priced fairly. I used it to neck up from 3" to 4" ducting, reducing pressure in my bathroom exhaust system. Which allowed the pipe clamps to retain the ducting better. Would buy again.

A perfect solution for us. Old house didn’t have space around existing drier vent pipe.

Excellent conversion with seals.

does not fit into or onto a 3", I will need to cut slots in it to expand it

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