This one is designed to couple your 100mm. (stretch)vent tube to printer.
It attaches and quick-releases to and from your printer, using 4 pcs. of “dia.9mm. x h=8mm” neodymium magnets. 
If your magnet is shorter than 8mm you can always print some bushings under the magnets.
Holes for the magnets are in D9,1 x h8mm (snug fit, no adhesives required). So compensate accordingly.
Outer diameter for the ventilation hose/pipe/tube is 98mm. So you can clamp it or tape it.