This O-ring is a compact replacement seal aimed at needle socket and carburettor needle assemblies in small model engines. It acts as a service item to keep fuel from escaping at the needle socket, preserving consistent metering.
The component is formed from a nitrile elastomer to provide a flexible sealing surface that sits around the needle valve socket. That sealing preserves predictable needle behaviour during tuning and running.
Installation is straightforward: remove the needle assembly, clean the socket groove if needed, press the O-ring into position and reassemble the needle socket, checking for smooth needle travel and no fuel leakage. Common hobby tools are adequate.
Keep this part as a maintenance spare if you work on glow or small petrol engines to ensure the carburettor needle valve keeps a reliable seal during setup and after adjustments at the field.
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