O.S. Engine OS23818176 No.9 Fuel Nipple Replacement for 20A/20B/20E/20K/21B  [OS23818176]

No.9 Fuel Nipple Suitable for O.S. 20A/20B/20E/20K/21B

This universal nipple is supplied as a carburettor service component to restore a reliable fuel connection on the specified O.S. engines. It replaces worn or leaking nipples to stop fuel loss at the connection points.

Compatibility is confined to the model numbers shown in the product title; check the original fitting before attempting to install. The nipple is designed to sit cleanly at the fuel inlet or hose connection to maintain a neat flow path.

For fitting, remove the defective nipple, align the replacement so the seating face and threads match, and tighten gradually to secure a leak-free joint without over-torque. After installation run a short idle test and then normal running checks to confirm there are no leaks.

As part of tuning and upkeep this replacement helps keep the fuel supply sealed, which supports consistent engine response while making adjustments trackside or in the workshop.