OS O-Ring (S-3)

Keep your OS Engines equipment running smoothly with this genuine OS O-Ring (S-3), supplied under part number SCH-OS27881820. This replacement seal is intended for routine maintenance and repairs, helping to restore reliable sealing performance on compatible OS components.

The S-3 designation matches OS Engines parts catalogue references, making it easier to identify the correct item during servicing. For suggested compatibility, please refer to your engine’s manual and parts list to confirm the exact O-ring specification required.

Choosing original OS Engines spares helps ensure consistent fit and quality across your RC engine maintenance. Keeping a spare O-ring in your pit box is a simple way to minimise downtime at the field or track.