2-1/2 in. (63.5mm) Shop Vac Hose and Dust Port Adapter Guide
A 2-1/2 in. (63.5mm) fitting is the most common shop vac hose size in the US. Ridgid, Craftsman, and most big-box wet/dry vacs ship with a 2-1/2 in. hose end. It is also the outer size of many large table saw ports, which is why the two get mixed up.
Here is the catch. The 2-1/2 in. number is the hose size, not the tool port size. Most table saw ports are about 2-1/4 in. inside and 2-1/2 in. outside. So a 2-1/2 in. hose laid on a saw port often sits loose and leaks. A sized adapter locks both sides so the seal holds.
This page explains the 2-1/2 in. size, what really uses it, and the adapter that fits. If your tool port measures near 63.5mm on the inside, this is your size. If it is closer to 57 to 58mm inside, use the 2-1/4 in. page.
Power Tools With a 2-1/2 in. Dust Port
Tools with a verified 2-1/2 in. port. Linked tools open their full specs and the exact adapter that fits.
Milwaukee1 tool
The Adapter That Fits a 2-1/2 in. Port
Each adapter grips the 2-1/2 in. tool port on one end and steps it to your shop vac or dust extractor hose on the other end. Friction fit, no clamps. Made in the USA.
What the 2-1/2 in. (63.5mm) Shop Vac Hose Fits
A 2-1/2 in. hose measures about 63.5mm across. It is the size most US wet/dry vacs use out of the box. It moves a lot of air, so it is a good match for saws, planers, and floor sweeps that throw heavy chips.
On the tool side, few ports measure a full 63.5mm on the inside. The Milwaukee 2736-21HD 8-1/4 in. table saw is the one verified saw in our file with a 63.5mm inner port. Most other large saws are about 57 to 58mm inside with a 63.5mm outer lip, which puts them in the 2-1/4 in. family.
Because the size sits on both the tool port and the hose, an adapter for this size often steps 2-1/2 in. to a smaller tool port or to a dust collector inlet. The right adapter depends on the two ends you are joining.
Why 2-1/2 in. Hose Size and Tool Port Size Get Confused
The number on a shop vac hose is the hose, not your tool. A table saw port can read 2-1/2 in. on the outside and still be 2-1/4 in. on the inside where the adapter has to grip. That half-size gap is enough to leak.
The fix is to measure the inside of your tool port, then match the adapter to that. Keep the hose size for the other end of the adapter. One part, two correct fits.
How to Adapt a 2-1/2 in. Hose to a Smaller Tool Port
Pick your tool port size first. Open its page on this site for the verified inner size, or measure it with calipers. That is the tool end of the adapter.
Then set the other end to 2-1/2 in. for your shop vac hose. The GulpDust PETG adapter grips the tool port and steps out to the 2-1/2 in. hose, sealed with a friction fit. Made in the USA.
2-1/2 in. Dust Port FAQ
Is 2-1/2 in. a tool port size or a hose size?+
Mostly a hose size. 2-1/2 in. (63.5mm) is the standard US shop vac hose. On tools it is usually the outer lip of a large saw port whose inner size is about 2-1/4 in. The one verified saw in our file with a true 63.5mm inner port is the Milwaukee 2736-21HD table saw.
My table saw port looks 2-1/2 in. Which adapter do I need?+
Measure the inside of the port. If it is near 63.5mm inside, use a 2-1/2 in. adapter. If it is about 57 to 58mm inside, your saw is in the 2-1/4 in. family even though the outer lip is 2-1/2 in. The inner size is what the adapter grips.
Can I connect a 2-1/2 in. hose to a smaller tool?+
Yes. That is the most common use for this size. The adapter grips the small tool port on one end and opens to the 2-1/2 in. hose on the other. Set the tool end to your verified port size in the configurator and the hose end to 2-1/2 in.
Does a bigger hose pull more dust?+
A 2-1/2 in. hose moves more air than a 1-1/4 in. hose, so it clears heavy chips better on saws and planers. For small sanders and routers a smaller hose is fine. Match the hose to how much dust the tool makes.
Can I print this adapter myself?+
Yes. Buy the printed PETG part shipped from the US, or download the STL and print it at home. For a large 2-1/2 in. part we suggest PETG with 3 walls and 25 percent infill.