Crushproof DF25 Rubber Door Port Adapter 2-1/2 Inch for Exhaust Hose

As described. The only negative-the door does not seal to the housing. I tried adjusting the screw that holds it and it either bowed out or hung loosely. Perhaps a covex bubble on the inside of the cover would help. I secured the door with a small bungee attached to the small tab on the outside of the cover.

Box did not contain all required hardware. Flap only fastened on one side with no means to hold flap tight when closed.