Repa Market 4" to 3" Inch Male Fit Round Duct Reducer - Galvanized Steel Pipe Coupler/Increaser - Coupling for Round Duct Ventilation Systems - HVAC Heating/Cooling

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

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.

I needed to connect the 4" outlet on the back of a clothes dryer to a 3" vent pipe coming out of a wall.I had purchased a pvc adapter at the hardware store, which worked but was so large that it pushed the dryer too far away from the wall. This adapter is much more compact, works well.

Excellent conversion with seals.

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.

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.

Excellent 10” to 8” duct reducer. It’s very round and fit great where I needed it

Fit pipes well. Easy to use.