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

13mm adjust nut O-ring: installation guide

This Serpent 500903 item is an RC-scale O-ring intended for 13mm shock adjust nuts used in radio-controlled suspension assemblies. It functions as a small sealing and seating element that helps keep the adjuster in place and reduces fluid seepage around the adjuster area.

The part is listed as a direct replacement O-ring sized for 13mm adjust nuts; no chassis-specific compatibility is claimed here, so measure your adjuster before fitting. Inspect the adjust nut and seal seat for wear, then fit the O-ring so it sits evenly around the adjuster thread or groove to ensure correct sealing action.

Installation notes: thoroughly clean the adjuster and seat, slide the O-ring into its groove or over the adjust nut, and check for unrestricted adjuster travel and secure seating. After installation, cycle the damper through its travel to confirm there is no binding and that the O-ring remains seated under compression.

Role in setup: as a maintenance item this O-ring helps preserve shock function by keeping the adjuster sealed and free from contamination, supporting consistent damping behavior during setup and track use.