Side inlet adaptor for 55 Gallon drum cyclonic Thien Separator for 2.5" standard PVC inlet pipe.
STLs available in mm and in inches.
Mounting holes are .1875" diam.
Also added the STL for the 2.5" PVC to 2.5 Hose coupler for vacuum hose from MSC (mscdirect.com/product/details/48432249)
This is a long part that will want to curve up, so be careful to brim and glue as needed, especially if printing with ABS.
Also, because you will need to tightly fit a standard PVC pipe in the hole, be sure to scale the model to compensate for the shrinking of your material.
I used ABS because you can buy ABS to PVC pipe glue at the local hardware store.