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i may also try fitting the pvc on the OUTside next,since this shrinks the I.D and decreases airflow,marginally i guess.but it fits Extra-securely now,so it's kind of a bonus. can also use tape for a perfect Tight fit. i got 2 of these, 1 for my ryobi bt3100 saw, one for a ridgid spindle/belt sander. as others said, the 2" end is exact diameter oftoolport, since i had 2" pvc piping on hand, i cut a 4"length, then sawed out a 1/4" kerf/slotlengthwise.that lets it flex enough to fit inside the toolport and this adapter,nice and TIGHT.
I ordered the Jet band saw - since this was listed as the reducer that went with this band saw - I ordered it - it was only a couple of dollars - so no big deal - but it doesn't even come close to being the one for the band saw.
Usually the 2 1/2 inch hose will connect to the tool. Not designed to connect directly to a tool or shop vacuums. This adapter works great for what it is designed for. It is only for changing 4 inch hose to 2 1/2 hose.
The industry needs a better explanation for dust port sizes. if it were funnel shaped, it would have worked, but it's the exact same size as my dust port. it will not fit over , or inside my dust port. As another reviewer said. This has caused me agravation a few other times on shop vac and other tool dust port sizes.Gene it is NOT four inches, but slightly less. this is the exact same size as the tool port I have. If it were exactly four inches, it would have worked.
It is now in excess of my requirements. If I had known that this was included with the Dust Hood I would not have ordered it.
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