
Adapter dimensions are literally dimensions. This means that if you think it will fit a 2.5 inch port, it won't fit. Its diameter is exactly 2.5 inches, not "designed to be 2.5 inches". The same with the other end. I thought it would fit into the table saw's knuckle, but it was exactly the same diameter, so I glued it on for now. Later I just bought an adjustable dust bag and put it on the plug. I'll keep it with me in case I need it later, but it definitely wasn't what I expected.

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