Hon&Guan4 Flange, Dust Collection Fittings Dryer Vent Wall Plate Collection Fittings for Heating Cooling Ventilation Vent System-2PCS.

you need to change your measurements in the description, there not even close!!

Can’t complain. Decent molded plastic pieces, finished well enough, and they fit properly with the HVAC components they’re supposed to.

I decided to try to make some (feral) cat shelters out of used coolers. I bought the 4" and 5 " covers to line the entry/ exit hole. I needed a 6" too, but decided to try something else for the 6" hole. The 4" was really too small for the cats and did not end up using it. I wanted the tube to stick out to help create a bit of a rain barrier. The red Igloo cooler was so thick that the tube was almost flush with the wall, so it didn't matter which way it was installed. I installed it with the flange on the outside to cover the unsightly, rough edges of the hole. The blue Coleman cooler was thin enough to get the tube to stick out a bit. I was hoping this would be a nice tight fit, but it was pretty loose. I didn't want the ugly look of duct tape. I tried some electrical tape around the rim, but it didn't stick. Someone had recommended using calk to seal the hole, but one of the instructional videos said their cats don't like the smell of the calk and won't use the shelters. I really like that this had the screw holes, and I didn't have to worry about messy calk. Low price and screw holes were great for my project.

I was glad that someone actually makes this product

This product fit perfectly for what i needed it to do. No it wasn't what it was meant for, but for what i needed it to do, it was perfect. I used it to attach a computer fan motor to help draw more air.