Connect a DeWalt miter saw dust elbow (1-1/2 in outer) to a 2-1/2 in shop-vac hose
How to join a DeWalt miter saw dust elbow (1-1/2 in outer) to a 2-1/2 in shop-vac hose, and what stops it leaking dust.
Not a direct fit. Joining the DeWalt miter saw dust elbow (1-1/2 in outer) to a 2-1/2 in shop-vac hose needs a 1-1/2 in to 2-1/2 in step reducer.
Rings drawn to scale from the measured diameters in the table below.
The two ends
| End A | DeWalt miter saw dust elbow (1-1/2 in outer) (1-1/2 in OD, 38 mm OD) |
|---|---|
| End B | 2-1/2 in shop-vac hose (2-1/4 in OD, 2-1/4 in ID) |
| Fit type | male port into hose cuff |
| Reducer needed | 1-1/2 in to 2-1/2 in step reducer |
Shop notes
Measured across the joint between the DeWalt miter saw dust elbow (1-1/2 in outer) and the 2-1/2 in shop-vac hose, the hose (57 mm) is 19 mm larger than the port (38 mm), so the port rattles inside without gripping. A 1-1/2 in to 2-1/2 in step reducer closes that 19 mm step so the two hold together instead of leaking at the gap.
A 19 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
Search Amazon for 1-1/2 in to 2-1/2 in step reduceraffiliate searchRelated connections
- DeWalt miter saw dust elbow (1-1/2 in outer)1-1/2 in outer, 1-3/8 in inner
- 2-1/2 in shop-vac hose2-1/2 in nominal, cuff approx 2-1/4 in OD
- DeWalt DWS779 / DWS780 miter saw port to 2-1/2 in shop-vac hoseneeds a reducer
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