I used ¾ inch PVC but 1 1/2 pipe would be stronger use 3 elbows and one T, don’t use glue and it can be taken apart easily. Drill 1/8 for the ¾ and ¼ for the 1 ½ holes on the inside of the pipe put the vacuum on the outside of the T. Use whatever you have for a plastic bag to go over the frame, Latex is better but a plastic bag from a new single bed works great. Seal the opening with two pieces of wood and clamps or a wooden dowel and a piece split tubing like a Ziploc. For breathing just cut out a small hole for a piece of thick plastic tubing 1 inch or so can be used to breathe through and it can be pulled out between users and sterilized. With a used Bissell you can suck yourself into oblivion.
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