Cover seals.

Cover seals are mechanical components used to cover and protect an opening or connection in a machine or mechanical system, such as a bearing housing. These cover seals be manufactured in various materials and shapes to suit different applications and requirements for protection and sealing.

The function of a cover seal is to shield the exposed area from dirt, dust, moisture, corrosion, or other damage that may occur from external factors. 

Examples of applications where cover seals are used include motors, gearboxes, pumps, ventilation and cooling systems, as well as electronic and electrical equipment. In general, the function of a cover seal is to protect an opening and increase the lifespan of a machine or system by minimizing the risk of damage and maintenance needs.