A doughnut-shaped seal that is principally used to prevent liquids and air from getting out or getting into particular spaces is the main function of an O-Ring. Even called a mechanical gasket, O rings are made to fit between a groove and a compression, during the welding of two or more parts. It is this that then forms a sealing at the interface. Utilized when pressures are high, O-ring provides a critical function across several applications, making O-Ring distributors all across the country most in demand!