PortMatchMatch any tool dust port to any shop-vac or collector hose, with the exact reducer

Not a direct fit. Joining the Bosch ROS20 random-orbit sander port to a Festool D50 antistatic hose needs a 35 mm to 50 mm step reducer. Measured OD and ID of each end, the real-world trap, and the exact reducer to buy.

Updated 05 September 2026.

CONNECTION

Connect a Bosch ROS20 random-orbit sander port to a Festool D50 antistatic hose

How to join a Bosch ROS20 random-orbit sander port to a Festool D50 antistatic hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the Bosch ROS20 random-orbit sander port to a Festool D50 antistatic hose needs a 35 mm to 50 mm step reducer.

END B49.2 mmFestool D50 antistatic hose (1-15/16 in ID)
END A35 mmBosch ROS20 random-orbit sander 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 ABosch ROS20 random-orbit sander port (1-3/8 in OD, 35 mm OD)
End BFestool D50 antistatic hose (1-15/16 in ID)
Fit typemale port into hose cuff
Reducer needed35 mm to 50 mm step reducer

Shop notes

Measured across the joint between the Bosch ROS20 random-orbit sander port and the Festool D50 antistatic hose, the hose (50 mm) is 15 mm larger than the port (35 mm), so the port rattles inside without gripping. A 35 mm to 50 mm step reducer closes that 15 mm step so the two hold together instead of leaking at the gap.

A 15 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

Shop 35 mm to 50 mm step reducer on AmazonaffiliateFind 35 mm to 50 mm step reducer on eBayaffiliate

Related connections

Questions and answers

Connect a Bosch ROS20 random-orbit sander port to a Festool D50 antistatic hose?

Not a direct fit. Joining the Bosch ROS20 random-orbit sander port to a Festool D50 antistatic hose needs a 35 mm to 50 mm step reducer.