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Rockler 2-1/2'' to 2-1/4'' Conversion Port

Item #
90% of 100

Connect your shop vacuum to benchtop tools like a band saw or chop saw or anything with a 2-1/2" OD dust port! The 2-1/2" ID fitting with rubber boot and included hose clamp seals tight on 2-1/2" ports like T- or Y-fittings on your dust collection system or a power tool dust port. The other side, a 2-1/4" ID fitting, quick-connects to the hose on your shop vacuum, making it easy to bring dust collection to every benchtop tool in your shop!

(1) Rockler 2-1/2'' to 2-1/4'' Conversion Port
More Information
Brand Rockler
Weight 0.3000
Tech Spec
  • Small Opening ID: 2-1/4''
  • Large Opening ID: 2-1/2''
Size 2-1/2"
Material Plastic
Type Adapter
4.5 / 5.0
74 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Perfect fit
Don't ask for much in a conversion port. Works exactly as needed.
June 22, 2020
1 month ago
Woodworking Experience:
Part of the dust system, worked good.
April 25, 2020
2 months ago
Woodworking Experience:
Use this when all else fails!
My Craftsman miter saw came with a dust port that didn't fit any known dust fitting size! I put this on the port and now can use my 2 - 1/2 inch shop vac. It works great!
April 15, 2020
3 months ago
Woodworking Experience:
High quality couplers!
I ordered several different couplers from Rockler, as I was using the Dust Deputy and Shop Vac method. Everything went together nicely and works well. I am only connected to my wood lathe, and a second gate with the smaller Rockler adapter kit for my sander and other hand tools. All went smooth! Very good quality items!
April 13, 2020
3 months ago
Woodworking Experience:
The coupler worked perfect for attaching my 2-14" Craftsman shop vacuum.
April 3, 2020
4 months ago
Reduce connector
Working good, the price acceptable,
March 12, 2020
5 months ago
Woodworking Experience:
Great product as used above
Ideal coupler from 2 1/2 dust collection ports or ducts to connect to shop vac
January 31, 2020
5 months ago
Woodworking Experience:
I received this adapter earlier than expected.
It’s a perfect fit for my Rikon bandsaw and disc belt sander.
Thanks Rockler
December 30, 2019
6 months ago
Woodworking Experience:
Works great
Great adapter
October 27, 2019
11 months ago
Woodworking Experience:
Really makes it easy to connect two different size fittings
September 30, 2019
over 2 years ago
Woodworking Experience:
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 6 questions Browse 6 questions and 62 answers
Why did you choose this?
Rockler Store
I want to make a quick connect set up to the 4 " hose for my router table.
Mark B on Jun 28, 2020
can never have enough of these.
Mark D on Jun 9, 2020
I want to make a quick connect set up to the 4 " hose for my router table.
Mark B on Jun 28, 2020
Needed addition for hose connections.
Louis P on Jun 13, 2020
can never have enough of these.
Mark D on Jun 9, 2020
I have an extensive 2.5 inch dust collection system in my shop. Rockler has all the attachments and connectors I have needed.
Dane S on Jun 6, 2020
fit my dust deputy
David C on May 19, 2020
To connect my shop vac tools with your 40' shop vac hose
Sharon Foye F on May 13, 2020
For ease of connecting the 4" hose reducer to a run of 2 1 /2" hose feeding 3 machines
SAMUEL S on May 9, 2020
I currently have a 2" dust hose and want to outfit my entire shop. Seems 2 1/2 inch is a standard so I need something to help connect existing to new.
Eric W on May 8, 2020
Setting up a dust collection system.
Jesse P on May 5, 2020
Have lots of vacuum parts and this will allow me to mix and match with my current hoses.
cb88 on Apr 27, 2020
To step down from his to table saw outlet
ADB1616 on Apr 26, 2020
Added a machine to the shop
George on Apr 23, 2020
Repair hose to shop vac
John F on Apr 22, 2020
Need for my wood shop and new machine I need to add to my vacuum system.
Phil on Apr 20, 2020
Get things to fit
James Y on Apr 16, 2020
I need something i can disconnect quick
James C on Apr 16, 2020
needed to attach hoses
GERALD*OCHESKEY O on Apr 11, 2020
3rd one
steven t on Mar 18, 2020
I am connecting my small system to a shop vac
Barbara J on Mar 12, 2020
Connect vacuum handle to metal blast gate
RICHARD L on Mar 11, 2020
charles w on Mar 10, 2020
Different connections for different tools
James Y on Mar 1, 2020
Using for connecting 2.5" hose to shop vac hoses or to my cyclonic separator with a 2.5" port..
Robert B on Feb 29, 2020
Needed to convert from 2 1/2" vacuum tubing to 2/14"vacuum attachments for tools
Lisa S on Feb 22, 2020
I can't remember
Paul S on Feb 8, 2020
Needed for router table fence
Rodney S on Dec 27, 2019
Only one I could find that did what I needed
Carl on Sep 30, 2019
to connect a new shop vac to power tools
gig man on Sep 24, 2019
To connect my shop vac to my DeWalt DW735x planer.
Lowry H on Sep 24, 2019
Standardizing tool vac sizes.
Bill on Jul 31, 2019
To connect a small dedicated shop vac to my Kobalt miter saw station.
Eric M on Jul 4, 2019
Need the adapters
Rob on Jul 3, 2019
To connect vacum hose to custom built router table.
Daryl D on Jul 1, 2019
Table saw connection
Kenny S on Jun 18, 2019
Works great!
Quinn2 on May 25, 2019
Easier than making my own.
Elton C on Apr 27, 2019
For use with my band saw.
Gregory M on Apr 12, 2019
band saw
James Blackmore E on Apr 6, 2019
spicing lines
Allen R on Mar 13, 2019
Connection to my miter saw
George E J on Feb 1, 2019
To attach my shopvac to my Jet 12" Compound miter saw.
Scott C on Jan 19, 2019
router jig hose conversion
Joe W on Jan 17, 2019
different hose sizes
Clyde O on Jan 6, 2019
Need adapter for certain tools.
Gary R F on Dec 25, 2018
trying to fit to older vacuum
R O on Nov 23, 2018
To quick connect to 2 1/2" hose.
Jeffrey L on Nov 15, 2018
setting up my CNC!
Daniel K on Sep 16, 2018
to connect separator hose to ridgid shop vac inlet port connector.
Burce C on Jul 31, 2018
Need it to attach now vacuum hose (Sears Craftsman) to and old shop vacuum (also Sears Craftsman).
John B on Jul 30, 2018
For adapting recently ordered "T" to my ShopVac hoses.
Mike on Jul 28, 2018
Needed addition for hose connections.
Louis P on Jun 13, 2020
I have an extensive 2.5 inch dust collection system in my shop. Rockler has all the attachments and connectors I have needed.
Dane S on Jun 6, 2020
Does this rotate/swivel or is it fixed?
Ron E on Apr 5, 2016
BEST ANSWER: I should add that although the hard plastic part can rotate withing the rubber sleeve, it doesn't move as freely as these two parts together: "Rockler 2-1/2'' Swivel Fitting for Shop Vacs" in "Rockler Dust Right® 2-1/2'' Rubber Union for Dust Collection."

Additionally, on occassion the plastic has come apart from the rubber when I had pulled the hose too hard. Easy to put back together, but if you want a more positive swivel connection, get the two parts.
I have a 2 1/2" OD port and a 2 1/2" hose. Will this work as a quick connect? I'd place the hose on it permanently and slip it on and off the port. I can't find a specific product that describes that situation.
Brian on Mar 22, 2017
I struggled with this type of connection, too. The rubber part of this #49887 conversion port will be a loose fit over the outside of a 2 1/2" port, and it may be time consuming to change the clamp if you want to move it. I think you will want part #31660, 2 1/2" swivel fitting, which you can permanently clamp into both ends of your hose with hose clamps either #39482 or #29509. I found that these connectors on my hose will nicely slip into 2 1/4" I.D. fittings such as my shop vac intake and a 2 1/2" port or elbow from a stationary tool.
Hope this helps.
will this work from a shopsmith vac to dewalt plainer?
roger on Oct 20, 2016
I can tell you the measurements of this adapter, which worked great for my Craftsman Sanding Table, but you'll have to check the exact measurements of your planer port and vacuum hose to see if they will fit. The Conversion Port's rubber flange with the hose clamp has a 2 1/2" inside diameter, so you'd want a 2 1/2" O.D. outlet from your planer. The hard plastic end of the Rockler adapter (which nicely swivels freely, by the way) has a 2 1/4" I.D., so your vacuum hose end should be 2 1/4" O.D.
My shop vac hose was too narrow, so I used Rockler's 2 1/2" Dust Hose #56647 with a 2.5" coupling # 36973. I hope this helps !
What is the outside diameter of the 2-1/4" ID side?
Bill B on Feb 24, 2019
BEST ANSWER: The outside diameter of the 2-1/4" side is 2-1/2".
I have a Kolbolt Table saw with a 2 1/2" OD outlet but a shop vac hose 1 7/8" OD anyone with any ideas?
Don B on Jan 18, 2020
Prop 65 WarningWARNING: Cancer & Reproductive Harm -

Prop 65 WarningWARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to
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