My 008 resides on a deck just off of the kitchen. The location is perfect except that there is no overhead covering. It seems like the first 5 or 6 smokes that I did were during heavy snow or rain storms. Needless to say, everything was coming through the top vent hole and onto the item I was smoking.
I tried all sorts of makeshift covers for the vent but nothing seemed to work well. One day, when walking through the plumbing section of my local hardware store I spotted my solution - A heavy galvanized 90 degree street elbow such as the one here. As I recall, 1 1/4 inch is the perfect size to fit over the vent and its fitting. I think I paid about $3. Keeps the elements out without blocking the vent, heavy enough that it's not blown away by high winds and, if you don't look to close, it looks like it's a part of the unit.