I got this from Martin, aka Yogitunes for when I moved in year before last. I've run this periscope setup since May 2015 with no issues at all. No leaks, no clogging, nothing.
For those needing an alternative dryer venting setup, here's the link
Thanks, my flex vent whatever works but may want to upgrade to something better someday and looks like they have all kinds of inexpensive and unique solutions that are also safe and up to code.