Adapter sizing is the most common source of confusion in dust collection. There are four main tool port sizes and three main shop vac hose sizes. The adapter you need depends on which combination you have.
This guide covers every common combination. Find your tool port size on the left and your shop vac hose size at the top.
Tool Port Sizes (Your Tool's Dust Port)
- 27mm, Festool tools (all models)
- 32mm, Milwaukee M18, DeWalt 20V MAX, Ryobi ONE+, Ridgid 18V, Black+Decker 20V, Craftsman V20, Porter-Cable 20V, BAUER 20V
- 35mm, Bosch 18V CORE, Bosch PROFACTOR, Metabo HPT
- 36mm, Makita LXT 18V, Makita XGT 40V
Shop Vac Hose Sizes
- 1-1/4 inch (31.75mm ID), DeWalt DCV517B, some Ridgid compact vacs
- 1-7/8 inch (47.6mm ID), Ridgid WD series, Craftsman, Kobalt, most 5-16 gallon US shop vacs, Milwaukee 0882-20, DeWalt DCV586B, Makita XCV04Z/XCV10Z
- 2-1/2 inch (63.5mm ID), Large shop vacs (16 gal+), miter saw ports, some table saw ports
Adapter Size Lookup Table
| Tool Port | To 1-1/4" Vac Hose | To 1-7/8" Vac Hose | To 2-1/2" Vac Hose |
|---|---|---|---|
| 27mm (Festool) | 27mm to 31.75mm | 27mm to 47.6mm | 27mm to 63.5mm |
| 32mm (Milwaukee / DeWalt) | 32mm to 31.75mm | 32mm to 47.6mm | 32mm to 63.5mm |
| 35mm (Bosch / Metabo HPT) | 35mm to 31.75mm | 35mm to 47.6mm | 35mm to 63.5mm |
| 36mm (Makita) | 36mm to 31.75mm | 36mm to 47.6mm | 36mm to 63.5mm |
The Most Common Adapters
These four cover about 80 percent of setups in US home shops:
32mm to 47.6mm (32mm tool port to 1-7/8 inch shop vac): Works for Milwaukee M18, DeWalt 20V, Ryobi, Ridgid, Craftsman, and Porter-Cable tools to any standard US shop vac.
36mm to 47.6mm (36mm tool port to 1-7/8 inch shop vac): Works for all Makita LXT 18V and XGT 40V tools to any standard US shop vac.
35mm to 47.6mm (35mm tool port to 1-7/8 inch shop vac): Works for Bosch 18V CORE, PROFACTOR, and Metabo HPT tools to any standard US shop vac.
27mm to 47.6mm (27mm tool port to 1-7/8 inch shop vac): Works for all Festool tools to any standard US shop vac. Use this if you have Festool tools but not a Festool CT extractor.
Connecting Miter Saws and Table Saws
Miter saws and table saws have larger ports (usually 2-1/2 inch at 63.5mm). For these you need a reducer, not an adapter that expands:
63.5mm to 47.6mm (2-1/2 inch saw port to 1-7/8 inch shop vac): Works for any miter saw or table saw with a 2-1/2 inch port when using a standard shop vac.
63.5mm to 57.15mm (2-1/2 inch to 2-1/2 inch shop vac): If your shop vac uses a 2-1/2 inch hose (typically 16-gallon and larger), you can connect the miter saw port directly with no reducer. Check your vac hose inner diameter first.
Connecting a Tool to a Festool CT Extractor
If you want to run non-Festool tools through a Festool CT extractor:
- Milwaukee/DeWalt tool (32mm port) to Festool CT (27mm hose): 32mm to 27mm adapter
- Makita tool (36mm port) to Festool CT (27mm hose): 36mm to 27mm adapter
- Bosch tool (35mm port) to Festool CT (27mm hose): 35mm to 27mm adapter
This combination is popular among woodworkers who own non-Festool tools but want Festool HEPA extraction quality.
How to Use This Guide
- Find your tool port size. Measure the OD of the port stub or look it up in the GulpDust tool database.
- Find your shop vac hose size. Check the cuff or measure the inner diameter of the hose end.
- Find that combination in the table above. That is the adapter you need.
- Use the GulpDust configurator to find the exact part for your specific tool and vac model.