4.5 & 5 Qt Gearcase Housing Gasket - WP4162324

KitchenAid Stand Mixer transmission case gasket is an OEM replacement part responsible for maintaining a secure and leak-free seal within the transmission case of 4.5 & 5 Quart Kitchenaid stand mixers. Situated within the gearbox assembly of the appliance, this gasket plays a critical role in preventing the leakage of lubricating oil and ensuring the smooth operation of the appliance's internal components.

It is recommended to replace this gasket if you open the gearcase of the mixer.  And also if the mixer is leaking gearbox grease.