O-rings, typically composed of rubber or other elastomeric materials, are circular rings designed to establish a watertight seal between two surfaces that mate with each other. They find widespread use in various applications, such as faucets, valves, and plumbing fixtures, where their purpose is to prevent leaks and maintain a consistent flow of water or other fluids. Versatile seali... https://partsfe.ca/plumbing-parts/o-ring