Adapt the 31mm ID vacum cleaner port of the Kreg Kregjig K5 Master System to accept 36mm OD hoses of Kärcher and the Festool shop vacuum cleaners. (Careful. Festool has 27, 36 and 50mm tubes.) Both sides are slightly tappered for a tight fit. ##This design has been tested and it works perfectly## The .AD_PRT file is the original design document made in Alibre Design / Geomagic Design. It is parametric can can be changed to fit the other Festool sizes. I won't create them because I have no such hoses to test that they actually fit. Blog entry: http://marcuswolschon.blogspot.de/2018/03/more-dust-collectors.html