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Connect a DeWalt DWS779 / DWS780 miter saw port to a Festool D50 antistatic hose

How to join a DeWalt DWS779 / DWS780 miter saw port to a Festool D50 antistatic hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the DeWalt DWS779 / DWS780 miter saw port to a Festool D50 antistatic hose needs a 1-5/8 in to 50 mm step reducer.

END B49.2 mmFestool D50 antistatic hose (1-15/16 in ID)
END A41 mmDeWalt DWS779 / DWS780 miter saw port (1-5/8 in OD, 41 mm OD)

Rings drawn to scale from the measured diameters in the table below.

The two ends

End ADeWalt DWS779 / DWS780 miter saw port (1-5/8 in OD, 41 mm OD)
End BFestool D50 antistatic hose (1-15/16 in ID)
Fit typemale port into hose cuff
Reducer needed1-5/8 in to 50 mm step reducer

Shop notes

Measured across the joint between the DeWalt DWS779 / DWS780 miter saw port and the Festool D50 antistatic hose, the hose (50 mm) is 9 mm larger than the port (41 mm), so the port rattles inside without gripping. A 1-5/8 in to 50 mm step reducer closes that 9 mm step so the two hold together instead of leaking at the gap.

A 9 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 1-5/8 in to 50 mm step reduceraffiliate search

Related connections

Sources: DeWalt DWS779 / DWS780 miter-saw port, 1-5/8 in OD reducer listing · 35 mm EU power-tool port convention (DeWalt / Bosch / Makita), retailer adapter data · Festool D 50 Antistatic Suction Hose (product spec, 50 mm nominal)