The cap holds the mixer's brushes in place. This part may also be purchased in the KitchenAid Brush Holder/Cap Kit if the other parts of the kit are needed.
Note: This original KitchenAid mixer brush cap will ONLY fit the K45SS, K5SS and later models. This cap is not interchangeable with the older style, or Pre-SS, mixers that originally had the brass fittings. This part WP3184212 replaces part numbers 3184212.