Originally Posted by dobdabomb
Not speculating, just curious as a larger value opening should help more. If that link from bbq guru hold correct you can have two equal 1 1/2's for aesthetics purposes as well as efficiency.
How did you tweak the slam latches to be that sealed. Looks as if the exhaust ends are different now than when you bought yours. Seems to be one built in the middle instead of a slide at the top.
We can provide you with a 1-1/4" to 3/4" stainless adaptor for $20 to go into one of the identical drain valves. It works great. We recommend the larger dual drain valves, because we want to maintain full unpowered draft functionality, that we believe the single 1-1/2" Valve may not provide.