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

Not a direct fit. Joining the RIDGID R4331 planer port to a 1-7/8 in shop-vac hose needs a 2-1/2 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 RIDGID R4331 planer port to a 1-7/8 in shop-vac hose

How to join a RIDGID R4331 planer port to a 1-7/8 in shop-vac hose, and what stops it leaking dust.

Reducer required

Not a direct fit. Joining the RIDGID R4331 planer port to a 1-7/8 in shop-vac hose needs a 2-1/2 in to 1-7/8 in step reducer.

END A64 mmRIDGID R4331 planer port (2-1/2 in OD, 64 mm OD)
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 ARIDGID R4331 planer port (2-1/2 in OD, 64 mm OD)
End B1-7/8 in shop-vac hose (1-7/8 in ID)
Fit typemale port into hose cuff
Reducer needed2-1/2 in to 1-7/8 in step reducer

Shop notes

Measured across the joint between the RIDGID R4331 planer port and the 1-7/8 in shop-vac hose, the port (64 mm) is 16 mm larger than the hose (48 mm), so it will not seat. A 2-1/2 in to 1-7/8 in step reducer closes that 16 mm step so the two hold together instead of leaking at the gap.

A 16 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 2-1/2 in to 1-7/8 in step reducer on AmazonaffiliateFind 2-1/2 in to 1-7/8 in step reducer on eBayaffiliate

Related connections

Questions and answers

Connect a RIDGID R4331 planer port to a 1-7/8 in shop-vac hose?

Not a direct fit. Joining the RIDGID R4331 planer port to a 1-7/8 in shop-vac hose needs a 2-1/2 in to 1-7/8 in step reducer.