Vacuum Port Sleeve

I have made a dust cabinet for my CNC Engraver (Woodpecker 3018). I have made a vacuum port in the back of the cabinet so that I can reduce the amount of dust particles both in the cabinet and in my workshop. The vacuum port is made from a couple of plumbing pipes (a 40 mm slab adaptor with the 45 mm pipe cut off, and a 44 mm PVC pipe glued together using PVC glue), the vacuum pipe has an outer diameter of 35 mm and the PVC pipe has an inner diameter of 38 mm, so a sleeve with an outer diameter