A Gasket also known as an o-ring or washer, seals the gap between two surfaces.

An Exhaust Flange gasket is a round gasket that is commonly called a donut gasket. this gasket is often used to prevent exhaust leaks between the cast-iron exhaust manifold and the exhaust pipe of an automobile or truck.

A Gasket is a mechanical seal designed to fill the space between two surfaces. its purpose is to prevent leakage or seepage.