Serpent 500903 O-ring for 13mm Shock Adjust Nuts Replacement  [SER500903]

Compatibility notes for 13mm adjust nut O-rings

This Serpent 500903 O-ring is intended for use with 13mm shock adjust nuts in radio-controlled suspension systems and functions as a sealing and seating component to limit oil seepage and help retain adjuster position.

The part is offered as a direct replacement for 13mm adjust nuts; it does not claim specific chassis compatibility, so always confirm the adjuster diameter on your shocks before fitting. Examine the adjust nut groove and surrounding seat for damage, then fit the O-ring so it sits evenly to ensure a reliable seal.

Fitment guidance: clean all mating surfaces, position the O-ring into the groove or over the adjust nut, and verify that the adjuster can still move freely without binding. After fitting, cycle the damper through its range to ensure the O-ring remains seated under compression.

Fitment impact: using a correctly sized O-ring helps prevent contamination and maintains consistent damping performance, but it is not a replacement for damaged adjusters or worn seats.