I had one on an 18.5 otg. Upside down of course. It fit perfect than after first cook it got stuck on and would not come off. Oh well it's still a great cooker.
Wonderful Family, Acorn Kamado, UDS Redhead, Mini Homer Simpson WSM, Smokey Joe Gold, Old style Smokey Joe, CGA , Green performer, 22.5 Redhead, 18.5 Redhead, 18.5 Redhead, 22.5 Limey, 22.5 WSM, 22.5 OTS Fire pit convert, weber fireplace, 18" Discada, Fish Fryer, Clay Pig Grill, Belson Trailer BBQ