Rubber O Ring Seal is a type of mechanical seal that is used to create a leak-tight seal between two mating surfaces. It is one of the most common types of seals used in hydraulic, pneumatic, and other mechanical systems. Rubber O-ring seals are made of high-quality rubber material, which is designed to provide excellent resistance to heat, pressure, and chemicals. They are typically circular and have a cross-section that resembles the letter O.