I put one on the bathroom outlet and it works great, the bathroom got too hot and now we can adjust it down and divert more to the front outlets.
I found them at two RV dealers parts departments in Reno. One was a direct replacement by the same manufacturer, and the other woudn't work because it was for a smaller cutout and the screws went into the existing cutout not into the wood. So check around to find the same brand, maybe take the old one with you. It is an easy job, just remove the three screws and pull it out, the excess flex duct comes out with it so you can pull the duct off and put it onto the new outlet and replace the screws.
Bob
This is what it looks like, just turn the knob and the two flaps behind the grill close like a butterfly valve, Oh, and it is two screws, not three.
