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Connect a DeWalt DWS779 / DWS780 miter saw port to a Festool D27 antistatic hose

How to join a DeWalt DWS779 / DWS780 miter saw port to a Festool D27 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 D27 antistatic hose needs a 1-5/8 in to 27 mm step reducer.

END A41 mmDeWalt DWS779 / DWS780 miter saw port (1-5/8 in OD, 41 mm OD)
END B35 mmFestool D27 antistatic hose (35 mm tip in OD, 7/8 in ID)

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 D27 antistatic hose (35 mm tip in OD, 7/8 in ID)
Fit typemale port into hose cuff
Reducer needed1-5/8 in to 27 mm step reducer

Shop notes

Measured across the joint between the DeWalt DWS779 / DWS780 miter saw port and the Festool D27 antistatic hose, the port (41 mm) is 18 mm larger than the hose (23 mm), so it will not seat. A 1-5/8 in to 27 mm step reducer closes that 18 mm step so the two hold together instead of leaking at the gap.

A 18 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 27 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 Owners Group, measured hose dimensions (D27, D36) · Festool Reducing Sleeve DC-D 36/27-AS (published reduction)