This sealing gasket is specially designed for Cuisinart blenders/food processors. It is supplied directly from original equipment manufacturer and it is sold individually. This gasket provides an air-right seal for the cutting blade assembly. It is made out of rubber material.

Genuine Cuisinart replacement part, this item is sold individually.
The Agitator Assembly (Or Blade Assembly) is the part of the blender that chops, blends or mixes the product that is put into the blender jar.

After time the blades will become dull or break or the spline that is attached to the shaft may wear out.
When replacing the Agitator it is advisable to replace the SPB-456-3 Sealing Gasket,. It has a tendency to compress and crack and cause the jar to leak at the bottom.