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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.
I own the JW1000 adapter and it fits perfectly into/inside my 4" dust collection hose and into/inside my 2 1/2" port on an oscillating spindle sander. If that is what you want get the Jet JW1000 4-Inch to 2-1/4-Inch OD 2-Inch ID Reducer2 1/2" dust ports typically have 1/8" thick plastic which creates an interior diameter (ID) of 2 1/4". Delta has an equivalent adapter (Delta P/N 50-482) but I do not own it so I can't recommend for or against it.Consider your application, measure the diameters, and then choose the adapter that fits your need. There seems to be some confusion/frustration about this item so consider if this is the item you actually need. This product is not designed to go directly from a 2 1/2" dust port to a 4" hose.
It pops out easily just on the weight of 6' of 2 1/2 in hose. This reducer is such a tight fit that I can barely get it deep enough in the mating fitting to hold. I use this almost daily when I swap the dust collector hood next to my lathe for a hose fitting to vacuum up all the chips that went elsewhere. I have a quick connect fitting on the 4" hose to easily swap it from the hood to this reducer.
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