I needed an electronics vacuum to clean the inside of laptops, desktops, keyboards etc. Canned air isn't very good at getting caked grime out of cooling ducts etc. Electronics vacuums aren't cheap so I designed this coupler to connect 1/2ID vinyl tubing to my hoover wind tunnel.Print the pieces and glue them together as shown in the photographs. Make sure that you have the taper of the large tube so that the smaller end faces away from the other part. It's made to work like the other wind tunnel attachments.