Product review (5 stars): Works well. One thing to note is the buttom ...
Works well. One thing to note is the buttom tube part is in fact two pieces of ABS plastic.  I wanted to ensure it would not leak air over time and vent properly so I got a can of Oatey all purpose cement and glued the seams.  After that I painted mine black and used some GEOCEL 2300 CLEAR Construction Tripolymer Sealant around the tube and mount plate to get a tight seal with my brick.  The only hard part I encountered was not having a hammer drill so drilling the holes in the masonry with a masonry bit still took some time.