Customer Reviews

Jet JW1044 4-to-2-1/2-Inch Reducer

5 star:		(17)
4 star:		(4)
3 star:		(6)
2 star:		(4)
1 star:		(14)

 

 

The 4" side fits my 4" quick release well enough. The 2 1/2" side fits the END of a 2 1/2" hose. This does not work well if you intend to go directly from your 2 1/2" port on your machine to your 4" dust collection hose. The adapter and the port will more than likely be the exact same size (two female sides).
The adapter is also not shaped the same as in the picture. It is not funnel shaped but a 2 1/2" tube and a 4" tube connected by a flat piece.

The adapter I received has a flat interface, not the funnel style shown. That makes a difference if using the piece with the airflow going from 4" to 2 1/2" due to increased turbulence.

If you're planning to use this downstream from large to small diameter then I suggest you find one that is indeed funnel-shaped.

This connector is female on both ends. I didn't pay close enough attention to the description while shopping and ordered it expecting to be able to connect my 2 1/2" shop-vac hose to the 4" dust collection port on my table saw. Needless to say, I was dismayed to discover the diameter of this adapter and the port on my table saw were the exact same OD - meaning it doesn't fit without a 4" hose between the two.

If you do end up in the same situation as me - don't give up hope. I aligned the adapter and DC collection and wrapped a length of duct tape around both. A solid connection that converts my tablesaw from 4" to 2 1/2" and works great! Hope that helps those who were in the same situation as I. For those who have yet to purchase, just make sure this is really the product you are looking for.

In case anyone is really concerned, the actual construction of this adapter is solid and accurate.

I used a few of these in my war against workshop dust: on the router table, on my DeWalt 746 tablesaw, on the miter saw, and on my Grizzly benchtop belt/disc sander. I have to say that if you want to reduce 4" flex hose or ducting to a 2 1/2" port, this is the absolute BEST way to go. The plastic is quite strong and always a consistent 4".

Highly Recommended!!!

This adapter is great for mating the popular 2 1/2" vacuum hose size to your 4" hoses. This 4" is a male end that will fit well into your 4" hose acting as a female, and the 2 1/2" end is a female that will receive your 2 1/2" hose as a male. :-) I don't know why that is so funny, but it strkes me that way. That is the best description I can give it. These Jet adapters fit perfectly.
To securely connect this adapter, I suggest that you buy the Jet wire connectors, instead of the standard band clamps. Since most dust collection hoses have a wire running through them, band clamps can not compress them. The Jet wire clamp goes around the wire in the hose, and it grips the material directly to the fitting. I tried using the band clamps, and after having to reattach them on a regular basis, I went to the Jet 4" wire clamps, that is why I am making such a big deal out of it. I have never had to retighten, or reinstall the hose on the adapter since. The wire clamps work perfectly. Highly recommended.

I bought this to connect my 4" Jet hose to the 2 1/2 port on my bandsaw and table saw. All the current research is to keep the dust collector draw (I have the Jet 1100) at 4" (6" on a planer) until right before the machine (actually to rebuild any machine to accept a 4"). The ad does say it's 2 1/2 OD and silly me, I didn't bother measuring the 2 1/2 at the tool end. Guess what? They're both 2 1/2 OD so they do NOT fit together. In my opinion, this is a worthless adapter - as it doesn't advertise as a hose to hose connector, and hooking a 2 1/2 shop vac to a 4" opening at the tool is like trying to suck dust out of a garbage can with a straw - the physics are wrong - this should be only used for reducing a 4" hose to 2 1/2" at the tool, but again it's the wrong diameter. A proper adapter should be either 2 1/4 OD or 2 1/2 ID to fit over the tool's port. Does anyone know where to find such an animal? I finally found a rubber plumbing connector (at Home Depot) that joined the two 2 1/2 OD fittings together. This works but we should've have to do this for a peice of plastic they charge over $5 for. Please do not hook a shop vac to a jointer and expect to remove the 1 to 5 micron diameter dust particles that can cause COPD (lung disease), you'll only get the chips, sort of.

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.

Just be advised, this is not a standard 4-2.5 reducer, this thing will only work with a jet machine 4" coupling.

WATCH OUT!
My Jet JW1044 4" to 2 1/2" adapter arrived today. Because I needed one badly I paid $6.81 for the part and $9.99 for shipping BUT I needed an adapter that was 4" INSIDE diameter on the large end and 2 1/2" inside diameter (nominal) on the small end.
The item I received, marked "JW1044", is 4" OUTSIDE diameter on the large end.
THERE IS NO INDICATION OF THE TRUE, USEFUL, SIZES OF THE ENDS OF THIS ADAPTER IN THE AMAZON LISTING!
WATCH OUT!

I used this adapter to go from my tablesaw to shopvac which is...suprise,suprise... 4" to 2.5"! Only problem was the 4" side would not fit into the outlet of the saw. This is because both are tapered to accept a hose. So...I cut of piece of 4" dryer hose about 3" long, and strapped them up with the metal bands. Works for me with nominal dust.