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Confused by shop vac hose sizing

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Forum topic by Gadabout55 posted 01-16-2022 03:38 PM 588 views 0 times favorited 15 replies Add to Favorites Watch
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Gadabout55

55 posts in 3368 days


01-16-2022 03:38 PM

My current shop vac is a Dewalt 6 gal model that replaced an older Craftsman model. I’d like to connect the shop vac hose to the dust port on my old Craftsman router table. The inside diameter of the dust port is approximately 2-1/4”. The outside diameter of the shop vac hose fitting is approximately 1-3/4”, so I need an adapter to join the two. I haven’t found anything in local stores that would work. Looking around online for a possible adapter, I have a hard time judging, since none of them seem to provide actual dimensions. Can anyone help?


15 replies so far

View OnhillWW's profile

OnhillWW

342 posts in 2690 days


#1 posted 01-16-2022 03:53 PM

Welcome to the wild west where anything goes and there are no rules. It is the sad state of affairs where there is little to no standardization in the world of dust collection below 4” diameters. My coping mechanism is to buy a bunch and sift through the box of odds and ends I have collected. Electrical tape is a good thing to have on hand to make those just a bit too small male fittings fit the females (by wrapping the outside OD and in doing so making the OD larger). Here are a few places to browse.
https://www.ptreeusa.com/dust_index.html
https://www.oneida-air.com/flex-hose/adapters
Additionally I have had luck on amazon as well. Remember that just because a vendor states that a fitting is on one dimension that once in hand you may find that it is not exactly as stated. And then there is the whole world of metric sized fittings….
Good Luck

-- Cheap is expensive! - my Dad

View Lazyman's profile

Lazyman

9591 posts in 2845 days


#2 posted 01-16-2022 04:26 PM

A 3D printer is handy for making my own adapters. I have found a couple of PVC fittings in the plumbing department at HD that work too. One was a drain reducers that was rubber that worked to adapt the weird sized inner port on the DW 735 planer to my shop vac hose. I also found that the OD of a 1-1/2” PVC elbow fits inside the female end of a Craftsman or Ridgid vac hose. The elbow was what I needed for a particular connection but you may find that other PVC fittings have a similar size (I haven’t tried them).

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View RClark's profile

RClark

290 posts in 3643 days


#3 posted 01-16-2022 05:13 PM


My current shop vac is a Dewalt 6 gal model that replaced an older Craftsman model. I’d like to connect the shop vac hose to the dust port on my old Craftsman router table. The inside diameter of the dust port is approximately 2-1/4”. The outside diameter of the shop vac hose fitting is approximately 1-3/4”, so I need an adapter to join the two. I haven’t found anything in local stores that would work. Looking around online for a possible adapter, I have a hard time judging, since none of them seem to provide actual dimensions. Can anyone help?

- Gadabout55

Another vote for the plumbing aisle.

I don’t have a specific product to mention, but I’ve had success for this kind of stuff by perusing the plumbing fittings at the local big box store. You know the outside diameters you need, perhaps something like this will match up:

-- Ray

View OnhillWW's profile

OnhillWW

342 posts in 2690 days


#4 posted 01-16-2022 05:15 PM

Yes, PVC fittings are an option

As are automotive hoses

-- Cheap is expensive! - my Dad

View OnhillWW's profile

OnhillWW

342 posts in 2690 days


#5 posted 01-16-2022 05:18 PM

Yes, PVC fittings are an option

As are automotive hoses


Something like this helps as well

-- Cheap is expensive! - my Dad

View dbw's profile

dbw

711 posts in 3094 days


#6 posted 01-16-2022 05:27 PM

Check this out. I used to have one. It works except the hose is heavy. I sold it for this reason.

https://www.rockler.com/dust-right-flexiport-power-tool-hose-kit-with-auxiliary-ports-3-to-12-expandable

-- Woodworking is like a vicious cycle. The more tools you buy the more you find to buy.

View Gadabout55's profile

Gadabout55

55 posts in 3368 days


#7 posted 01-16-2022 06:54 PM

Thanks much everyone for all the suggestions. I didn’t think this was going to be so complicated. I thought there must be a standard adapter available.

View DougC's profile

DougC

38 posts in 4092 days


#8 posted 01-17-2022 01:03 AM

- RClark


I agree with RClark. I have had great success using these on a few tools.

View Knockonit's profile

Knockonit

1235 posts in 1660 days


#9 posted 01-17-2022 01:10 AM

https://www.amazon.com/Cen-Tec-Systems-94709-Multi-Brand-Collection/dp/B0849L6LLH/ref=sr_1_4?crid=303NKWFZCKFVH&keywords=centec+dust+collection+hose&qid=1642381757&sprefix=centec+%2Caps%2C135&sr=8-4

i read a thread on here some time ago and a gent posted this unit, so being curious as OP, i ordered, and walla, what a great surprise, all fittings with several that fit different OS, and the hose is a whole lot lighter than the rockler rendition, and does not collapse as suction is applied, perhaps collapse is wrong word, retract unto itself, making it a battle to use under suction, that is the other halfs coments, and i’m not one to push back on those. ugh

good luck, orbitals are nasty dust producers
rj in az

-- Living the dream

View Madmark2's profile

Madmark2

3439 posts in 2046 days


#10 posted 01-17-2022 03:00 AM

Hoses & pipes are measured by ID, not OD. 4” metal and plastic have the same ID’s but their wall thickness and hence OD are different. PVC has its own set of rules. Wall thickness often isn’t listed. If you buy as much as you can from one vendor most of it will fit—sorta. Clamps and metal tape are your friends. Mix brands, grades & materials and you’re asking for trouble. I too have a stack of mismatched bits and pieces. Use metal blast gates.

-- The hump with the stump and the pump!

View WoodenDreams's profile

WoodenDreams

1590 posts in 1369 days


#11 posted 01-17-2022 04:13 AM

The bothersome thing about dust ports on machines, is that there not a industry standard on dust port sizes used by manufactures. I have two machines that the hoses didn’t match to fit the dust ports. I had to use a propane torch to heat up and stretch to a larger diameter, so the dust hose would fit in. One other dust port on a spindle sander, I had to heat up to shrink the ports diameter. Otherwise I would of have to use duck tape, to connect the hose.

View bigblockyeti's profile

bigblockyeti

8526 posts in 3178 days


#12 posted 01-17-2022 01:45 PM

As Nathan mentioned, 3D printing opens up infinite possibilities. If what you’re looking to adapt is even somewhat common, you can find someone selling a printed adapter on ebay or the like.

-- “I never in my life thought I would have to say this, but the proper role of government is not to fund the distribution of crack pipes,” Lauren Boebert

View bondogaposis's profile

bondogaposis

6183 posts in 3809 days


#13 posted 01-17-2022 02:27 PM

Join the club, there is no standardization on shop vac ports or machine dust ports. I have a number of universal fittings that don’t fit anything I have. I have had the best luck with the Cen Tech Systems fittings as I was able to hook up both of my ROS’s to my rigid shop vac. There seems to be a lot of trial and error involved and in the end you will wind up with a drawer full of fittings that don’t fit anything, like the rest of us.

-- Bondo Gaposis

View Madmark2's profile

Madmark2

3439 posts in 2046 days


#14 posted 01-17-2022 03:08 PM

3d printing for $150 – review HERE

-- The hump with the stump and the pump!

View Foghorn's profile

Foghorn

1522 posts in 844 days


#15 posted 01-17-2022 03:14 PM



Hoses & pipes are measured by ID, not OD. 4” metal and plastic have the same ID s but their wall thickness and hence OD are different. PVC has its own set of rules. Wall thickness often isn t listed. If you buy as much as you can from one vendor most of it will fit—sorta. Clamps and metal tape are your friends. Mix brands, grades & materials and you re asking for trouble. I too have a stack of mismatched bits and pieces. Use metal blast gates.

- Madmark2


Steel and plastic pipe are measured by nominal inside diameter (NPS). The OD doesn’t change but the ID does based on schedule or wall thickness. Tube is also measured by nominal ID. “Tubing” is measured by OD.

-- Darrel

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