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Connect a DeWalt random-orbit sander stepped port to a Festool D36 antistatic hose

How to join a DeWalt random-orbit sander stepped port to a Festool D36 antistatic hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the DeWalt random-orbit sander stepped port to a Festool D36 antistatic hose needs a 26 / 32 / 35 mm to 36 mm step reducer.

END B44 mmFestool D36 antistatic hose (44 mm tip in OD, 1-1/2 in ID)
END A35 mmDeWalt random-orbit sander stepped port (1-3/8 in OD, 35 mm OD)

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

The two ends

End ADeWalt random-orbit sander stepped port (1-3/8 in OD, 35 mm OD)
End BFestool D36 antistatic hose (44 mm tip in OD, 1-1/2 in ID)
Fit typemale port into hose cuff
Reducer needed26 / 32 / 35 mm to 36 mm step reducer

Shop notes

Measured across the joint between the DeWalt random-orbit sander stepped port and the Festool D36 antistatic hose, the hose (38 mm) is 3 mm larger than the port (35 mm), so the port rattles inside without gripping. A 26 / 32 / 35 mm to 36 mm step reducer closes that 3 mm step so the two hold together instead of leaking at the gap.

A 3 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.