. The first thing to know about this is that it's hard rubber, not plastic. I bought this for a Kobalt portable table saw to upgrade to my super old shop vacuum with a custom hose size. It turned out that the hole on my table saw was exactly the same size as the large end of this adapter. The reason I give it 5 stars, however, is because I cut four triangular pieces out of the big end, squeezed them together, stuck them into the exhaust port of my table saw as hard as I could, AND IT REALLY…