Connect a DeWalt DWE7491RS blade-guard port to a 2-1/2 in shop-vac hose
How to join a DeWalt DWE7491RS blade-guard port to a 2-1/2 in shop-vac hose, and what stops it leaking dust.
Not a direct fit. Joining the DeWalt DWE7491RS blade-guard port 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 DWE7491RS blade-guard port (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 DWE7491RS blade-guard port 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
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