1-7/8 in. (47.6mm) Shop Vac Hose Size and Dust Adapter Guide
A 1-7/8 in. (47.6mm) fitting is a mid-size shop vac hose. It sits between the small 1-1/4 in. hose and the big 2-1/2 in. hose. Many Milwaukee M18 wet/dry vacs and a lot of standard shop vacs use it.
This is a hose and vacuum size, not a hand-tool port size. Almost no power tool has a 1-7/8 in. port molded into it. So this page is about the hose end, not the tool end. It shows what uses 1-7/8 in. and how to step it to whatever tool you are hooking up.
If your tool port is smaller, which it almost always is, a sized PETG adapter grips the tool port on one end and opens to your 1-7/8 in. hose on the other end. Sealed friction fit, no tape.
The Adapter That Fits a 1-7/8 in. Port
Each adapter grips the 1-7/8 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 Uses the 1-7/8 in. (47.6mm) Hose Size
The 1-7/8 in. size shows up on shop vac hoses and vacuum outlets, not on tool dust ports. Milwaukee M18 FUEL wet/dry vacs use a 47.6mm hose. Many mid-size shop vacs use it too. It is a good all-around size that moves more air than a 1-1/4 in. hose without the bulk of a 2-1/2 in. hose.
Because it lives on the vacuum end, you almost never fit it straight onto a tool. You fit it to an adapter, and the adapter grips the tool port on the other side.
How to Step a 1-7/8 in. Hose Down to Your Tool Port
Start with your tool. Find its verified port size on this site, or measure the port with calipers. That is the tool end of the adapter. Most hand-tool ports are 1-1/4 in. or smaller.
Set the other end of the adapter to 1-7/8 in. for your hose. The GulpDust PETG adapter grips the small tool port and opens out to the 1-7/8 in. hose, sealed with a friction fit. Made in the USA.
1-7/8 in. Dust Port FAQ
Which power tools have a 1-7/8 in. (47.6mm) dust port?+
Almost none. 1-7/8 in. is a shop vac hose and vacuum outlet size, not a hand-tool port size. If a listing says a tool has a 1-7/8 in. port, it is usually quoting the hose that fits over it, not the tool port itself. Measure the tool port to be sure.
What vacuums use a 1-7/8 in. hose?+
Milwaukee M18 FUEL wet/dry vacs use a 47.6mm hose, and many standard mid-size shop vacs do too. It is a common middle size between 1-1/4 in. and 2-1/2 in.
How do I connect a 1-7/8 in. hose to a small tool?+
Use an adapter. Set the tool end to your verified port size in the configurator, and set the hose end to 1-7/8 in. The adapter grips the tool port and opens to the hose so the dust flows straight into the vacuum.
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. We suggest PETG with 3 walls and 25 percent infill.