I bought some 2.5" flex hose from Peachtree. The ID is pretty close to 2.5".
With other (larger) flex pipe, I've always been able to find some sort of fitting or coupler that I can slide the pipe over. For instance, 6" flex typically can be stretched over 6" ASTM2729 solid pipe, 4" flex can be stretched to fit over 4" PVC pipe, etc. Obviously I need to slip the flex pipe over some kind of solid pipe to be able to connect it to the DC ductwork, or to build blast gates, etc.
But... I can't find ANYTHING that this 2.5" flex fits onto. They don't make S&D pipe that small, and 2.5" PVC pipe has an ID of 2.5", so it won't fit inside (or outside) of this flex hose. Shop vac fittings are 2.25" OD, so that doesn't work, either.
Does anyone know of a plastic (preferably) pipe I can buy that is 2.5" OD? If not, I'm going to buy 2.5" PVC and heat it up and squeeze it down until it fits...