O.S. Engines O-Ring S-3 #27881820

The O.S. Engines O-Ring S-3, part number 27881820, is a genuine replacement seal commonly used on the mixture control valve or mid-speed needle in compatible O.S. nitro engine carburetors.

A worn, flattened, or damaged O-ring can affect fuel mixture control, tuning consistency, idle quality, and overall engine performance. Replacing small carburetor seals during maintenance helps prevent air leaks, fuel seepage, and inconsistent needle adjustment.

This OEM O.S. replacement O-ring is a useful part to keep on hand for carburetor service, engine rebuilds, and routine nitro engine maintenance.

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