What is the primary purpose of a gasket?

The primary purpose of a gasket is to create a seal between two stationary parts. This sealing function is crucial in preventing leaks of fluids or gases that are contained within the assembly. Gaskets are typically made from materials that can withstand the operating conditions, such as temperature and pressure, ensuring that they maintain an effective seal over time.

While other options may present activities related to gasket use, they do not encapsulate the fundamental purpose as effectively. Filling excessive gaps could be a secondary function in certain scenarios, but it is not the primary design intention. Holding bolts in proper spacing is usually managed by other components in a mechanical assembly, while preventing gouging of flange faces relates more to the installation process and gasket design, but again, is not the primary function of the gasket itself. The creation of a reliable seal is essential in preventing leaks and maintaining system integrity, which underscores why this is the correct choice.