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

Not compatible without stepping down. A 1-7/8 in shop-vac hose is far larger than the Dust collector 5 in inlet, so it needs a 5 in to 1-7/8 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 Dust collector 5 in inlet to a 1-7/8 in shop-vac hose

How to join a Dust collector 5 in inlet to a 1-7/8 in shop-vac hose, and what stops it leaking dust.

Not compatible

Not compatible without stepping down. A 1-7/8 in shop-vac hose is far larger than the Dust collector 5 in inlet, so it needs a 5 in to 1-7/8 in step reducer.

END A127 mmDust collector 5 in inlet (5 in ID)
END B47.6 mm1-7/8 in shop-vac hose (1-7/8 in ID)

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

The two ends

End ADust collector 5 in inlet (5 in ID)
End B1-7/8 in shop-vac hose (1-7/8 in ID)
Fit typehose cuff into female socket
Reducer needed5 in to 1-7/8 in step reducer

Shop notes

The hose tip is about 48 mm and the port socket about 127 mm, a gap of 79 mm, so the port socket simply swallows the hose tip with no contact. A 5 in to 1-7/8 in step reducer is needed, and even reduced the airflow is mismatched between the Dust collector 5 in inlet and the 1-7/8 in shop-vac hose.

Wrapping tape to close a 79 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 5 in to 1-7/8 in step reducer on AmazonaffiliateFind 5 in to 1-7/8 in step reducer on eBayaffiliate

Related connections

Questions and answers

Connect a Dust collector 5 in inlet to a 1-7/8 in shop-vac hose?

Not compatible without stepping down. A 1-7/8 in shop-vac hose is far larger than the Dust collector 5 in inlet, so it needs a 5 in to 1-7/8 in step reducer.