HG Power Soffit Vents 4 inch, Round Vent Cover with Built-in Screen Mesh, ABS Louver 4” Exhaust Vent for Exhaust Fan, HVAC Ducting, Bathroom, Kitchen, Garage Use, 100mm, White

I bought a 3" and 6" for my bathroom vents. The 3" fit perfectly over my 2" schedule 40 plumbing vent and the 6" fit perfectly over my 6" aluminum bathroom exhaust fan. They look great on the outside with a flush and clean look. I am surprised at how well they worked.

Used to replace broken old part, fit perfectly.

Does the job.

The vent’s air regulator, doesn’t moves.Material built ; not strong enough

Just as described.

Worked as expected and great price!! Cheaper than buying from Home Depot or Lowes.

I installed this in overhand soffit. It has keepers to keep it from falling out, but they left it very loose. I drilled 3 holes in the outer flange and screwed it down. Nice and flush now.

...but both can be solved. The big one is that the spring tabs do not grip drywall, the only press against it. When attaching ductwork from the inside it falls out of the hole quite easily. Really problematic for ceiling applications.Here are some solutions: 1) Perimeter facial screws & sheetrock anchors (not pretty, but able to withstand a mild push). 2) A helper on the other side to push back when attaching ductwork. 3) Construction adhesive applied liberally around the base and the neck--requires a day or two to set up. 4) Cut the drywall at a sharp bevel to allow the spring tabs to open wider. Caveat: Rough handling can rip open the sheetrock. 5) What I did: used a right-angle, low-profile screw gun to drive three i-5/8" dry wall screws 1/2" into the perimeter of the duct neck at sheetrock level. Helper advised.The other problem is the inner plastic bug grill: Tight enough to thwart mosquitos or fruit flies, but a serious impediment to air flow. Once it gathers enough dust to clog, it can only be cleaned by removing the duct work from the inside--which usually involves cutting & replacing zip tie straps. My solution: trashed it. Alternate solution for accessible ductwork: improvise an in-line enclosure for a removable filter.