Seal

The seal, also called [oil seal
", the function of the oil seal is to stop whatever fluid is inside from leaking out the clearance between the shaft and housing. The seal may also be used to prevent outside materials, such as dirt, from moving in through the clearance.
Nitrile oil seal is widely used in many applications, including that oil resistance is needed or which low temperature functionality is required. These include automotive, aircraft fuel systems, marine applications and more.
Benefits: Excellent abrasion and tear resistance, cost effective
Limitations: Nitrile is not good at resisting degradation by ozone or weather.