This is a higher quality replacement for Part No ADU4905. A high Specification, temperature and oil resistant Valve Stem Seal. This seal does not break down with either oil or elevated temperatures making it ideal for High Performance, NOS & Turbocharged Engines. This seal is suitable for the Inlet or Exhaust Valves. Please note: This seal is not suitable for Turbo Exhaust Valves due to the size difference, you require part no MRA4020.

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