Summary

Print the parts with supports, cut out a 6" chunk of conduit. Attach the 90 degree angle to the gurney and the bottom the conduit. Attach the ring piece onto the top of the conduit and slide the shop vac hose through the ring and reattach to your shop vac. I would glue all pieces to the conduit ends with cyanoacrylate (crazy glue). Conduit should stick straight up in the air.

Updated for easier printing.