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Connect a Makita track saw / router 36 mm port to a Festool D50 antistatic hose

How to join a Makita track saw / router 36 mm port to a Festool D50 antistatic hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the Makita track saw / router 36 mm port to a Festool D50 antistatic hose needs a hose 27 mm ID / 36 mm OD tool end to 50 mm step reducer.

END B49.2 mmFestool D50 antistatic hose (1-15/16 in ID)
END A36 mmMakita track saw / router 36 mm port (1-7/16 in OD, 36 mm OD)

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

The two ends

End AMakita track saw / router 36 mm port (1-7/16 in OD, 36 mm OD)
End BFestool D50 antistatic hose (1-15/16 in ID)
Fit typemale port into hose cuff
Reducer neededhose 27 mm ID / 36 mm OD tool end to 50 mm step reducer

Shop notes

Measured across the joint between the Makita track saw / router 36 mm port and the Festool D50 antistatic hose, the hose (50 mm) is 14 mm larger than the port (36 mm), so the port rattles inside without gripping. A hose 27 mm ID / 36 mm OD tool end to 50 mm step reducer closes that 14 mm step so the two hold together instead of leaking at the gap.

A 14 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.