Serpent SER500904 13mm Shock Cap O-Ring Replacement Seal  [SER500904]

Sealing performance and durability

The Serpent SER500904 Shock 13mm cap o-ring functions as the sealing element at the shock cap junction. It prevents oil escape and blocks debris from entering at the cap interface, which helps maintain stable damping performance over time.

Fit a new o-ring if the original is flattened, nicked, or leaking. This seal is located at the cap rather than on the piston or shaft, so the swap is simple and requires only removing the cap assembly. Clean the groove and check the cap face for imperfections prior to seating the o-ring to ensure a good long-lasting seal.

As part of tuning and maintenance, renewing the 13mm cap o-ring when you change oil or adjust preload helps avoid leaks that could degrade handling consistency or increase wear on internal parts.