Profile: American Rubber Industries is a manufacturer of rubber hoses, hydraulic hoses, rubber sheets, hydraulic & pneumatic fittings, rubber moldings, rubber extruding, cut gaskets and PVC products. We offer a wide range of O rings in various diameters. An O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus. It is a loop of elastomer with a disc-shaped cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.