Serpent 500903 13mm Shock O-ring Replacement for RC Suspension  [SER500903]

Durability notes for 13mm adjuster O-rings

This Serpent 500903 O-ring is produced for use with 13mm shock adjust nuts in radio-controlled suspension systems. It serves as a sealing and seating component to limit oil migration and help maintain adjuster position under load.

The item is specified as a direct replacement sized for 13mm adjust nuts; no specific chassis fit is asserted, so verify dimensions on your shock before installation. Check the adjust nut groove and surrounding seat for wear or damage, then place the O-ring so it sits evenly to promote correct sealing performance.

Service guidance: remove dirt and old lubricant, position the O-ring into the groove or over the adjust nut, and ensure the adjuster can still move freely. Cycle the damper slowly through travel after fitting to confirm the O-ring remains in place under compression and does not extrude or roll.

Maintenance impact: keeping a fresh, undamaged O-ring installed helps keep contaminants out of the adjuster interface and maintains steady damping characteristics for longer service intervals.