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

Drum sander 4 in dust port: measured 4 in port, 3.9 in OD / 3.6 in ID. What shop-vac hose fits it and the exact reducer to join it to a 1-1/4, 2-1/2 or 4 inch hose.

Updated 05 September 2026.

PORT / HOSE

Drum sander 4 in dust port dust port size

The measured dimensions of the Drum sander 4 in dust port and the hose sizes it mates with.

OD99 mm3-15/16 in, 99 mm
ID91 mm91 mm

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

Measured port dimensions

Port typemale spigot (hose goes over it)
Outer diameter (OD)3-15/16 in, 99 mm
Inner diameter (ID)91 mm
Manufacturer designation4 in port, 3.9 in OD / 3.6 in ID
Mating diameter (mm)99

Shop notes

Found on: Jet, SuperMax and Grizzly open-ended and closed drum sanders.

Drum sanders throw fine dust in volume and present the 4 in machine port for a collector. A 4 in flex hose seats over the 3.9 in outer, and a shop vac is undersized for the airflow this tool needs.

Connect this port

Questions and answers

What is the port type of the Drum sander 4 in dust port dust port size?

male spigot (hose goes over it)

What is the outer diameter (od) of the Drum sander 4 in dust port dust port size?

3-15/16 in, 99 mm

What is the inner diameter (id) of the Drum sander 4 in dust port dust port size?

91 mm

What is the manufacturer designation of the Drum sander 4 in dust port dust port size?

4 in port, 3.9 in OD / 3.6 in ID