Sub-Sea O-rings are specialized seals used in underwater applications to prevent the ingress of water or other fluids into equipment or systems. They are critical components in sub-sea engineering, where the sealing of joints, connections, and valves is vital to prevent leaks, protect against corrosion, and ensure the safe operation of sub-sea equipment.

Sub-Sea o-rings are typically made of elastomeric materials, such as nitrile, fluoroelastomer, or silicone, which are highly resistant to compression and deformation, as well as chemical and thermal degradation. These materials are selected based on their ability to withstand the harsh conditions encountered in sub-sea environments, including high pressure, low temperature, and exposure to seawater, chemicals, and hydrocarbons.

In sub-sea applications, o-rings are often used in conjunction with other sealing technologies, such as metal-to-metal seals, to create a reliable and effective seal. For example, o-rings may be used to seal the primary sealing surface, while metal-to-metal seals are used to provide additional backup sealing.