Editorial Product Review:

Amazon.com Item Description:
Ideal for woodworkers with Shop-Vacs or the equivalent, the Jet 4-Inch to 2-1/2-Inch Reducer allows you to step down from a larger size machine. The reducer connects 4-inch line to 2-1/2-inch dust ports. The step down increases air velocity where it is needed most. With an outer diameter of 2-1/2-by-4-inches, this reducer lets you adapt to many machines.



Accessories available:
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Accessories available:

• This Old House (1-year)
• Building Construction Illustrated

Product Availability: Usually ships in 24 hours

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More related to this product:
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More related to this product:

• JET JW1317 4" Wire Hose Clamp - Each
• Jet JW1007 4-Inch Blastgate
• Jet JW1015 4-Inch Y-Fitting Dust Hose Connector
• Jet JW1047 4-Inch Quick Disconnect
• Jet JW1031 4-Inch x 10-Foot Black Dust Collection Hose
• click for more

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Customer Rating: - Good as a connector for vacuum hose
This adapter works great for what it is designed for. It is only for changing 4 inch hose to 2 1/2 hose. Not designed to connect directly to a tool or shop vacuums. Usually the 2 1/2 inch hose will connect to the tool.

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Customer Rating: - Don't trust the four inch size, get exact ID and OD size
As another reviewer said..... this is the exact same size as the tool port I have.... it is NOT four inches, but slightly less. If it were exactly four inches, it would have worked.... 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. The industry needs a better explanation for dust port sizes.... This has caused me agravation a few other times on shop vac and other tool dust port sizes.

Gene

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Customer Rating: - 2 1/2" reducer
If I had known that this was included with the Dust Hood I would not have ordered it. It is now in excess of my requirements.

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Customer Rating: - You may want the JW1000
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. If that is what you want get the Jet JW1000 4-Inch to 2-1/4-Inch OD 2-Inch ID Reducer

2 1/2" dust ports typically have 1/8" thick plastic which creates an interior diameter (ID) of 2 1/4". 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. 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.