Product review (5 stars): Solid, heavy duty vent with a design to keep rodents out
I debated whether to spend so much on a vent but all other products are cheap plastiic. I was desperate to close all potential entries to rodents so went for it. Once I saw and held it I realized why the price.  It was worth it for me. One caveat is that you will likely need the extension ( i needed 9" to connect inner to outer). I didn't want to wait one more day to do laundry so I went to the hardware store and found a suitable substitute.