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Connect a Fein 30 mm tool port to a Festool D27 antistatic hose

How to join a Fein 30 mm tool port to a Festool D27 antistatic hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the Fein 30 mm tool port to a Festool D27 antistatic hose needs a 30 mm to 27 mm step reducer.

END B35 mmFestool D27 antistatic hose (35 mm tip in OD, 7/8 in ID)
END A30 mmFein 30 mm tool port (1-3/16 in OD, 30 mm OD)

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

The two ends

End AFein 30 mm tool port (1-3/16 in OD, 30 mm OD)
End BFestool D27 antistatic hose (35 mm tip in OD, 7/8 in ID)
Fit typemale port into hose cuff
Reducer needed30 mm to 27 mm step reducer

Shop notes

Measured across the joint between the Fein 30 mm tool port and the Festool D27 antistatic hose, the port (30 mm) is 7 mm larger than the hose (23 mm), so it will not seat. A 30 mm to 27 mm step reducer closes that 7 mm step so the two hold together instead of leaking at the gap.

A 7 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.