Connect a DeWalt DWE7491RS rear dust port to a Festool D50 antistatic hose
How to join a DeWalt DWE7491RS rear dust port to a Festool D50 antistatic hose, and what stops it leaking dust.
Not a direct fit. Joining the DeWalt DWE7491RS rear dust port to a Festool D50 antistatic hose needs a 2-1/2 in to 50 mm step reducer.
Rings drawn to scale from the measured diameters in the table below.
The two ends
| End A | DeWalt DWE7491RS rear dust port (2-1/2 in OD, 64 mm OD) |
|---|---|
| End B | Festool D50 antistatic hose (1-15/16 in ID) |
| Fit type | male port into hose cuff |
| Reducer needed | 2-1/2 in to 50 mm step reducer |
Shop notes
Measured across the joint between the DeWalt DWE7491RS rear dust port and the Festool D50 antistatic hose, the port (64 mm) is 14 mm larger than the hose (50 mm), so it will not seat. A 2-1/2 in to 50 mm step reducer closes that 14 mm step so the two hold together instead of leaking at the gap.
A 14 mm mismatch feels close enough to force, and it will hold for a minute before it works loose under airflow. Fit the step ring rather than trusting friction on a gap this size.
The reducer to buy
Shop 2-1/2 in to 50 mm step reducer on AmazonaffiliateFind 2-1/2 in to 50 mm step reducer on eBayaffiliateRelated connections
- DeWalt DWE7491RS rear dust port2-1/2 in OD rear port
- Festool D50 antistatic hose50 mm nominal (1-15/16 in)
- DeWalt DWS779 / DWS780 miter saw port to Festool D50 antistatic hoseneeds a reducer
- DeWalt miter saw dust elbow (1-1/2 in outer) to Festool D50 antistatic hoseneeds a reducer
- DeWalt random-orbit sander stepped port to Festool D50 antistatic hoseneeds a reducer
- 35 mm EU power-tool port (DeWalt / Bosch / Makita) to Festool D50 antistatic hoseneeds a reducer