This small O-ring is supplied as a spare sealing component for needle sockets and carburettor needle assemblies used in model engines. It functions to maintain correct fuel flow by preventing leaks at the needle socket interface.
Constructed from a fuel-resistant elastomer, the ring offers the necessary flexibility to form a tight seal around a needle valve socket. That sealing keeps fuel metering steady so tuning adjustments behave as expected.
To fit the ring, remove the needle assembly, inspect the groove for any debris, seat the O-ring into the groove and rebuild the needle socket, confirming the needle action is smooth and there is no fuel seepage. Ordinary hobby tools are sufficient for this task.
As a routine spare, the part is handy for model engine enthusiasts who perform regular servicing of glow or small petrol engines to ensure the carburettor needle valve maintains a reliable seal during setup and running.
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