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

Not a direct fit. Joining the Festool ROTEX RO 90 sander port to a 1-1/4 in shop-vac hose needs a 27 mm to 1-1/4 in 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 Festool ROTEX RO 90 sander port to a 1-1/4 in shop-vac hose

How to join a Festool ROTEX RO 90 sander port to a 1-1/4 in shop-vac hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the Festool ROTEX RO 90 sander port to a 1-1/4 in shop-vac hose needs a 27 mm to 1-1/4 in step reducer.

END B31.8 mm1-1/4 in shop-vac hose (approx 1-1/2 cuff in OD, 1-1/4 in ID)
END A27 mmFestool ROTEX RO 90 sander port (1-1/16 in OD, 27 mm OD)

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

The two ends

End AFestool ROTEX RO 90 sander port (1-1/16 in OD, 27 mm OD)
End B1-1/4 in shop-vac hose (approx 1-1/2 cuff in OD, 1-1/4 in ID)
Fit typemale port into hose cuff
Reducer needed27 mm to 1-1/4 in step reducer

Shop notes

Measured across the joint between the Festool ROTEX RO 90 sander port and the 1-1/4 in shop-vac hose, the hose (32 mm) is 5 mm larger than the port (27 mm), so the port rattles inside without gripping. A 27 mm to 1-1/4 in step reducer closes that 5 mm step so the two hold together instead of leaking at the gap.

A 5 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 27 mm to 1-1/4 in step reducer on AmazonaffiliateFind 27 mm to 1-1/4 in step reducer on eBayaffiliate

Related connections

Questions and answers

Connect a Festool ROTEX RO 90 sander port to a 1-1/4 in shop-vac hose?

Not a direct fit. Joining the Festool ROTEX RO 90 sander port to a 1-1/4 in shop-vac hose needs a 27 mm to 1-1/4 in step reducer.