When I had a guru I turned one out of a piece of 3/4 black pipe union. i.e. one end was left threaded and the other end was turned to fit. I sold all that with Eli so I can't measure it for you. Maybe just buy the blower (25cfm) for now and get on with it …. you can buy the expensive stuff later …..
And on the eighth day God created barbecue …. because he DOES love us and he wants us to be happy.
Current smokers: Egor (trailered RF) and Easybake (tabletop pellet drive)