New 

Choice of:

100mm to 63mm (4" - 2.5")

or

100mm to 50mm (4" - 2")

REDUCER ADAPTOR

DURABLE HIGH QUALITY

Diameters are external. Approximate internal diameters are 

4" = 92.5mm

2 1/2" = 57.5mm

2" = 43.5mm

Internal has partial cone shape to assist airflow and flow of chips - less blockages - saves time.