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

Not compatible without stepping down. A Metabo ASR 35 mm hose is far larger than the Hobby CNC dust boot 2-1/2 in port, so it needs a 2-1/2 in to 35 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 Hobby CNC dust boot 2-1/2 in port to a Metabo ASR 35 mm hose

How to join a Hobby CNC dust boot 2-1/2 in port to a Metabo ASR 35 mm hose, and what stops it leaking dust.

Not compatible

Not compatible without stepping down. A Metabo ASR 35 mm hose is far larger than the Hobby CNC dust boot 2-1/2 in port, so it needs a 2-1/2 in to 35 mm step reducer.

END A64 mmHobby CNC dust boot 2-1/2 in port (2-1/2 in OD, 64 mm OD)
END B35 mmMetabo ASR 35 mm hose (1-3/8 in ID)

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

The two ends

End AHobby CNC dust boot 2-1/2 in port (2-1/2 in OD, 64 mm OD)
End BMetabo ASR 35 mm hose (1-3/8 in ID)
Fit typemale port into hose cuff
Reducer needed2-1/2 in to 35 mm step reducer

Shop notes

The hose is about 35 mm and the port about 64 mm, a gap of 28 mm, so the port simply swallows the hose with no contact. A 2-1/2 in to 35 mm step reducer is needed, and even reduced the airflow is mismatched between the Hobby CNC dust boot 2-1/2 in port and the Metabo ASR 35 mm hose.

Wrapping tape to close a 28 mm gap never seals cleanly and chokes the airflow further. Step the sizes properly, or pair each end with a fitting closer to its own size.

The reducer to buy

Shop 2-1/2 in to 35 mm step reducer on AmazonaffiliateFind 2-1/2 in to 35 mm step reducer on eBayaffiliate

Related connections

Questions and answers

Connect a Hobby CNC dust boot 2-1/2 in port to a Metabo ASR 35 mm hose?

Not compatible without stepping down. A Metabo ASR 35 mm hose is far larger than the Hobby CNC dust boot 2-1/2 in port, so it needs a 2-1/2 in to 35 mm step reducer.